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A delivery head for a beverage preparation machine comprising a movable first part, a fixed second part and a cartridge guide; the first part being movable between an open position and a clamping position; the cartridge guide being operatively engaged with the first part and slidably movable relativ

A delivery head for a beverage preparation machine comprising a movable first part, a fixed second part and a cartridge guide; the first part being movable between an open position and a clamping position; the cartridge guide being operatively engaged with the first part and slidably movable relative to the second part between a loading position and a dispensing position; the cartridge guide being located in the loading position when the first part is in the open position so as to enable loading of a cartridge into the cartridge guide; wherein on movement of the first part into the clamping position the cartridge guide is slidable into the dispensing position due to the operative engagement of the cartridge guide with the first part.

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1. A delivery head for a beverage preparation machine comprising a movable first part, a fixed second part and a cartridge guide; the first part being pivotally attached to the second part and movable between an open position and a clamping position;the cartridge guide being operatively engaged with

1. A delivery head for a beverage preparation machine comprising a movable first part, a fixed second part and a cartridge guide; the first part being pivotally attached to the second part and movable between an open position and a clamping position;the cartridge guide being operatively engaged with the first part and slidably movable relative to the second part between a loading position and a dispensing position;the cartridge guide being located in the loading position when the first part is in the open position so as to enable loading of a cartridge into the cartridge guide;wherein on movement of the first part from the open position toward the clamping position the cartridge guide slides into the dispensing position due to the operative engagement of the cartridge guide with the first part;wherein the cartridge guide is constrained to be slidable horizontally. 2. A delivery head as claimed in claim 1 wherein the loading position of the cartridge guide is towards a front of the delivery head and the cartridge guide is slidable into the dispensing position in a rearward manner during closure of the first part. 3. A delivery head as claimed in claim 1 wherein the cartridge guide is operatively engaged with the first part by means of co-operative formations of the cartridge guide and first part. 4. A delivery head as claimed in claim 1 wherein with the first part in the clamping position the first part is enabled to clamp a cartridge received in the cartridge guide. 5. A beverage preparation machine comprising a delivery head as claimed in claim 1. 6. A beverage preparation system comprising a beverage preparation machine as claimed in claim 5 and one or more cartridges, wherein the one or more cartridges contain one or more beverage ingredients. 7. A delivery head as claimed in claim 1 wherein a beverage can be dispensed from a cartridge loaded into the cartridge guide with the cartridge guide in the dispensing position. 8. A delivery head for a beverage preparation machine comprising a movable first part, a fixed second part and a cartridge guide; the first part being pivotally attached to the second part and movable between an open position and a clamping position;the cartridge guide being operatively engaged with the first part and slidably movable relative to the second part between a loading position and a dispensing position;the cartridge guide being located in the loading position when the first part is in the open position so as to enable loading of a cartridge into the cartridge guide;wherein on movement of the first part from the open position toward the clamping position the cartridge guide slides into the dispensing position due to the operative engagement of the cartridge guide with the first part;wherein the first part is pivotable about a pivot point between the open and clamping positions, the cartridge guide is slidable in a horizontal plane and the pivot point is offset from the horizontal plane. 9. A delivery head for a beverage preparation machine comprising a movable first part, a fixed second part and a cartridge guide; the first part being pivotally attached to the second part and movable between an open position and a clamping position;the cartridge guide being operatively engaged with the first part and slidably movable relative to the second part between a loading position and a dispensing position;the cartridge guide being located in the loading position when the first part is in the open position so as to enable loading of a cartridge into the cartridge guide;wherein on movement of the first part into the clamping position the cartridge guide is slidable into the dispensing position due to the operative engagement of the cartridge guide with the first part,wherein the cartridge guide is operatively engaged with the first part by means of co-operative formations of the cartridge guide and first part,wherein the cooperative formations comprise a pin on one of the cartridge guide and the first part and a channel in the other of the cartridge guide and the first part, the pin being constrained to move along the channel as the first part moves between the open and the clamping positions wherein the channel comprises at least a first portion associated with non-movement of the cartridge guide and a second portion associated with movement of the cartridge guide from the loading position into the dispensing position, the first portion of the channel comprising an arc of constant radius having a centre of rotation coincident with a pivot point of the first part, the second portion of the channel comprising a path having an instantaneous centre of curvature non-coincident with the pivot point of the first part. 10. A delivery head for a beverage preparation machine comprising a first part, a second part and a cartridge guide; the first part being pivotal relative to the second part and movable between an open position and a closed position;the cartridge guide being connected to the first part and movable relative to the second part between a loading position and a dispensing position;the cartridge guide being located in the loading position when the first part is in the open position so as to enable loading of a cartridge into the cartridge guide and being in the dispensing position when the first part is in the closed position;wherein on movement of the first part from the open position toward the closed position the cartridge guide and the second part move translationally relative to one another as the cartridge guide moves toward the dispensing position. 11. A delivery head as claimed in claim 10 wherein a beverage can be dispensed from a cartridge loaded into the cartridge guide with the cartridge guide in the dispensing position. 12. A delivery head as claimed in claim 10 further comprising co-operative formations configured to permit the relative translational movement of the cartridge guide and the second part with movement of the first part toward the closed position. 13. A delivery head as claimed in claim 12 wherein the cooperative formations includes a pin and a channel, the pin being constrained to move along the channel as the first part moves between the open and the closed positions. 14. A delivery head as claimed in claim 13 wherein the channel comprises at least a first portion associated with non-translational movement of the cartridge guide relative to the second part and a second portion associated with translational movement of the cartridge guide relative to the second part, wherein one of the first and second portions of the channel comprises an arc of constant radius having a centre of rotation coincident with a pivot point of the first part, the second portion of the channel comprising a path having an instantaneous centre of curvature non coincident with the pivot point of the first part. 15. A delivery head as claimed in claim 10 further comprising a piercer unit having an inlet piercer and an outlet piercer configured to pierce a cartridge on a common side of the cartridge. 16. A delivery head as claimed in claim 15 wherein both the inlet and outlet piercers are oriented generally parallel to each other. 17. A delivery head as claimed in claim 10 wherein the open position of the first part is disposed toward a rear of the delivery head and the closed position of the first part is disposed toward a front of the delivery head such that movement of the first part from the open position to the closed position includes moving the first part forward relative to the delivery head. 18. A delivery head as claimed in claim 10 wherein with the first part in the closed position the cartridge is configured to be clamped with the cartridge received in the cartridge guide. 19. A beverage preparation machine comprising a delivery head as claimed in claim 10. 20. A delivery head as claimed in claim 10 further comprising a channel and a pin constrained to move along the channel as the first part moves between the open and closed positions; and a first curved portion of the channel configured to direct the pin along a first curved path extending about a center of rotation; anda second curved portion of the channel having a different curvature than the first curved portion and configured to direct the pin along a second curved path extending about a center of curvature non-coincident with the center of rotation of the first curved portion. 21. A delivery head as claimed in claim 10 wherein the cartridge guide is constrained to only translational movement relative to the second part between the loading position and the dispensing position. 22. A delivery head as claimed in claim 10 wherein the connection between the cartridge guide and the first part includes an operative engagement between the cartridge guide and the first part so that on movement of the first part from the open position toward the closed position the cartridge guide moves translationally relative to the second part into the dispensing position due to the operative engagement of the cartridge guide with the first part. 23. A delivery head as claimed in claim 10 wherein the second part is fixed and wherein on movement of the first part from the open position toward the closed position the cartridge guide moves translationally relative to the fixed second part toward the dispensing position. 24. A delivery head for a beverage preparation machine comprising a first part, a second part and a cartridge guide; the first part being pivotal relative to the second part and movable between an open position and a closed position;the cartridge guide being movable relative to the second part between a loading position and a dispensing position;the cartridge guide being located in the loading position when the first part is in the open position so as to enable loading of a cartridge into the cartridge guide and being in the dispensing position when the first part is in the closed position;wherein movement of the first part from the open position toward the closed position causes movement including translational movement of one of the cartridge guide and the second part relative to the other of the cartridge guide and the second part. 25. A delivery head as claimed in claim 24 further comprising an inlet piercer and an outlet piercer mounted on the second part configured to pierce a cartridge on a common side of the cartridge. 26. A delivery head as claimed in claim 24 further comprising a channel and a pin constrained to move along the channel as the first part moves between the open and closed positions. 27. A delivery head as claimed in claim 26 wherein the channel comprises: a first curved portion of the channel having a curvature extending about a center of rotation; anda second curved portion of the channel having a curvature different than the curvature of the first curved portion and extending about a center of curvature non-coincident with the center of rotation of the first curved portion. 28. A delivery head as claimed in claim 27 wherein the first curved portion of the channel has a constant radius and the center of rotation of the first curved portion is substantially coincident with a pivot point of the first part with the first part in the open position. 29. A beverage preparation machine comprising a delivery head as claimed in claim 24. 30. A delivery head as claimed in claim 24 wherein the cartridge guide includes an aperture sized to receive a beverage cartridge. 31. A method of loading a cartridge into a delivery head of a beverage preparation machine of the type having a movable first part, a fixed second part and a cartridge guide, comprising the steps of: moving the first part into an open position by pivoting it relative to the second part so as to cause the cartridge guide to move into a loading position by virtue of an operative engagement of the cartridge guide and the first part;loading a cartridge into the cartridge guide;moving the first part from the open position toward a closed position thereby causing the cartridge guide to slide relative to the second part into a dispensing position by virtue of the operative engagement of the cartridge guide and the first part;wherein the cartridge guide slides horizontally. 32. The method of claim 31 wherein the cartridge is clamped by the first part when the cartridge guide is in the dispensing position. 33. The method of claim 31 wherein the cartridge guide moves from a foremost position to a rearward position as it moves from the loading position to the dispensing position. 34. The method of claim 31 wherein the first part pivots between the open and closed positions. 35. The method of claim 31 wherein the cartridge is supported by the second part in the loading and dispensing positions, and remains in sliding contact with the second part as it moves from the loading to the dispensing position. 36. The method of claim 31 further comprising dispensing a beverage from the cartridge loaded in the cartridge guide when the cartridge guide is in the dispensing position. 37. A method of loading a cartridge into a delivery head of a beverage preparation machine of the type having a first part, a second part and a cartridge guide, comprising the steps of: moving the first part into an open position by pivoting it relative to the second part so as to cause the cartridge guide to move into a loading position;loading a cartridge into the cartridge guide;moving the first part from the open position toward a closed position thereby causing the cartridge guide and the second part to move translationally relative to one another as the cartridge guide moves toward a dispensing position thereof. 38. The method of claim 37 further comprising dispensing a beverage from the cartridge loaded in the cartridge guide when the cartridge guide is in the dispensing position. 39. The method of claim 37 wherein moving the first part from the open position toward the closed position thereby causing the cartridge guide and the second part to move translationally relative to one another includes sliding a pin along a channel. 40. The method of claim 37 further comprising pivoting inlet and outlet piercers relative to the cartridge loaded in the cartridge guide. 41. The method of claim 37 further comprising piercing a lid of the cartridge with inlet and outlet piercers.