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A method comprises a) attaching a first skin to a first surface of an open cell foam to form a precursor for a door, window or panel; and b) attaching a second skin to the precursor in a separate step from step a). A precursor for a door, window, or panel, comprises a skin attached to one face of an

A method comprises a) attaching a first skin to a first surface of an open cell foam to form a precursor for a door, window or panel; and b) attaching a second skin to the precursor in a separate step from step a). A precursor for a door, window, or panel, comprises a skin attached to one face of an open cell foam, but not to an opposing face of the open cell foam.

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1. A method comprising: a) attaching a first skin to a first surface of an open cell foam to form a precursor for a door, window or panel; andb) attaching a second skin to the precursor in a separate step from step a),wherein prior to attaching the second skin to the precursor, the precursor is modi

1. A method comprising: a) attaching a first skin to a first surface of an open cell foam to form a precursor for a door, window or panel; andb) attaching a second skin to the precursor in a separate step from step a),wherein prior to attaching the second skin to the precursor, the precursor is modified,wherein the second skin is attached to the precursor at a different location from the location at which the first skin is attached to the precursor,wherein, prior to attaching the second skin to the precursor, the precursor is shaped, trimmed, routed, drilled, varnished, coloured, or waxed. 2. A method according to claim 1 wherein the second skin is attached to a second surface of the foam, the second being an opposing surface to the first surface. 3. A method according to claim 1, wherein an adhesive is used to attach the second skin to the precursor. 4. A method according to claim 1, wherein, prior to attaching the second skin to the precursor, the precursor is adapted to receive one or more pieces of glazing. 5. A method according to claim 1, wherein, prior to attaching the second skin to the precursor, the precursor is adapted to receive one or more fittings for the door, window, or panel. 6. A method according to claim 5, wherein the one or more fittings are selected from the group consisting of: a handle, a lock, a plate, a catch and a hinge. 7. A method according to claim 1, wherein step b) is performed at least one hour after step a). 8. A method according to claim 1, wherein step b) is performed at least 24 hours after step a). 9. A kit, for use in a method according to claim 1, comprising a precursor comprising a skin attached to one face of an open cell foam, but not to an opposing face of the open cell foam, and a second skin that is not attached to the precursor, wherein the second skin comprises a preformed plastics element. 10. A kit, for use in a method according to claim 1, comprising a first precursor and a second precursor, wherein each of the first and second precursors comprises a skin attached to one face of an open cell foam, but not to an opposing face of the open cell foam. 11. A kit according to claim 9, further comprising one or more of: a) an adhesive,b) a reinforcement means,c) glazing,d) a door, window or panel fitting, ande) a paint, varnish, lacquer, stain or wax. 12. A door, window or panel, formed from a method according to claim 1, which includes a foam core which includes in the interior of the foam, a layer of adhesive generally in the plane of the door, window or panel, and which comprises a first precursor adhered to a second precursor, wherein the precursors comprise a skin attached to one face of an open cell foam, but not to an opposing face of the open cell foam. 13. A method of forming a door, window or panel, which method comprises: a1) attaching a first skin to a first surface of an open cell foam to form a first precursor for a door, window or panel, which precursor has an exposed foam surface;a2) attaching a second skin to a first surface of an open cell foam to form a second precursor for a door, window or panel, which precursor has an exposed foam surface; andb) attaching the exposed foam surface of the first precursor to the exposed foam surface of the second precursor to form a door, window or panel. 14. A method according to claim 13, wherein an adhesive is used to attach the second precursor to the first precursor. 15. A method according to claim 13, wherein prior to attaching the second precursor to the first precursor, the first precursor is modified. 16. A method according to claim 15, wherein, prior to attaching the second skin to the precursor, the precursor is shaped, trimmed, routed, drilled, varnished, coloured, or waxed. 17. A method according to claim 15, wherein, prior to attaching the second skin to the precursor, the precursor is adapted to receive one or more pieces of glazing. 18. A method according to claim 15, wherein, prior to attaching the second skin to the precursor, the precursor is adapted to receive one or more fittings for the door, window, or panel. 19. A method according to claim 18, wherein the one or more fittings are selected from the group consisting of: a handle, a lock, a plate, a catch and a hinge. 20. A method according to claim 13, wherein step b) is effected in a separate step after steps a). 21. A method according to claim 13, wherein step b) is performed at least one hour after steps a). 22. A method according to claim 21, wherein step b) is performed at least 24 hours after steps a). 23. A method according to claim 13, wherein the second skin is attached to the precursor at a different location from the location at which the first skin is attached to the second skin. 24. A method according to claim 13, wherein at least one of the precursors further comprises reinforcing means. 25. A method according to claim 24, wherein the reinforcing means is a mesh. 26. A method according to claim 13, at least one of the precursors further comprising a frame. 27. A method according to claim 26, wherein the frame is a wooden frame. 28. A kit according to claim 10, further comprising one or more of: a) an adhesive,b) a reinforcement means,c) glazing,d) a door, window or panel fitting, ande) a paint, varnish, lacquer, stain or wax. 29. A method comprising: a) attaching a first skin to a first surface of an open cell foam to form a precursor for a door, window or panel; andb) attaching a second skin to the precursor in a separate step from step a),wherein prior to attaching the second skin to the precursor, the precursor is modified,wherein the second skin is attached to the precursor at a different location from the location at which the first skin is attached to the precursor,wherein step b) is performed at least one hour after step a).