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A well comprising: (a) a safety mechanism, the safety mechanism comprising: (i) an obstructing member moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted; (ii) a movement mechanism; (iii) and a wireless receiver, adapted to receive a

A well comprising: (a) a safety mechanism, the safety mechanism comprising: (i) an obstructing member moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted; (ii) a movement mechanism; (iii) and a wireless receiver, adapted to receive a wireless signal; wherein the movement mechanism is operable to move the obstructing member from one of the first and second positions to the other of the first and second positions in response to a change in the signal being received by the wireless receiver; (b) sensors to detect a parameter in the well, in the vicinity of the safety mechanism; wherein a sensor is provided above and a sensor is provided below the safety mechanism. Embodiments of the invention have acoustic and/or electromagnetic receivers or transceivers.

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1. A well comprising: (a) a valve on a drill string, the drill string comprising a drill bit, and the valve comprising: (i) an obstructing member moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted through the drill string in order to

1. A well comprising: (a) a valve on a drill string, the drill string comprising a drill bit, and the valve comprising: (i) an obstructing member moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted through the drill string in order to shut the well downhole;(ii) a movement mechanism;(iii) and a wireless receiver, adapted to receive a wireless signal;wherein the movement mechanism is operable to move the obstructing member from one of the first and second positions to the other of the first and second positions in response to a change in the signal being received by the wireless receiver;(b) sensors to detect pressure in the well, in the vicinity of the valve; wherein a sensor is provided above and a sensor is provided below the valve to monitor differential pressure across the valve. 2. A well as claimed in claim 1, wherein the wireless receiver is one of: (i) an acoustic receiver and the signal is an acoustic signal;(ii) an electromagnetic receiver and the signal is an electromagnetic signal; and(iii) an electromagnetic receiver and an acoustic receiver and the signal is transmitted over part of its distance by the electromagnetic receiver and part of its distance by the acoustic receiver. 3. A well as claimed in claim 1, wherein the wireless receiver is a wireless transceiver. 4. A well as claimed in claim 1, further comprising a subsurface safety valve. 5. A well as claimed in claim 1, wherein the information provided by the sensors is retrieved wirelessly. 6. A well as claimed in claim 1, wherein the receiver is up to 100 m below the top of the well. 7. A well as claimed in claim 1, further comprising a device which is in use fitted or retro-fitted to a top of the well, comprising a wireless transmitter and a sonar receiver; for use in an emergency situation. 8. A well as claimed in claim 7, wherein the device is less than 1 m3. 9. A well apparatus comprising a well as claimed in claim 1, and a sonar receiver and a sonar transmitter. 10. A well apparatus as claimed in claim 9, wherein a satellite device is provided, the device comprising a satellite communication mechanism and configured to relay information received between the sonar receiver and the sonar transmitter and the satellite. 11. A method of inhibiting fluid flow from a well as claimed in claim 1 or a well apparatus as claimed in claim 9 in an emergency situation, the method comprising: in the event of an emergency situation, sending a wireless signal into the well to the valve. 12. A method as claimed in claim 11, wherein the wireless signal is sent during a phase where a BOP is provided on the well. 13. A method as claimed in claim 11, wherein the wireless signal is sent from a device provided at a wellhead apparatus of the well or proximate thereto. 14. A method as claimed in claim 12, wherein the wireless signal is sent from a platform with wireless repeaters provided on risers and/or downhole. 15. A method as claimed in claim 11, wherein the wireless signal is sent from a seabed wellhead apparatus, after receiving sonar signals from a surface installation or an ROV. 16. A method as claimed in claim 11 wherein an ROV connects to a seabed wellhead apparatus and send or receives signals via a hot-stab connection. 17. A method as claimed in claim 11, wherein the wireless signal is sent from a wellhead apparatus after receiving satellite signals from another location. 18. A well as claimed in claim 1, wherein the valve comprises a battery. 19. A well as claimed in claim 2, wherein the wireless receiver is an acoustic receiver and the signal is an acoustic signal. 20. A method as claimed in claim 11, wherein the signals are sent retroactively, after an emergency situation has occurred. 21. A well as claimed in claim 1, wherein a BOP is provided on the well. 22. A well as claimed in claim 1, wherein the valve comprises a ball or flapper valve. 23. A well as claimed in claim 1, wherein the valve incorporates at least one of: a mechanical over-ride; anda pump through facility to permit flow in one direction. 24. The well of claim 23, wherein the valve incorporates the mechanical over-ride and the mechanical over-ride is controlled by pressure, wireline, or coiled tubing. 25. The well of claim 24, wherein the mechanical over-ride is controlled by pressure. 26. The well of claim 1, wherein the valve is operable in response to a detected pressure. 27. The well of claim 1, wherein the valve is adapted to actuate using well pressure acting against an atmospheric chamber. 28. A method of deploying the valve according to claim 1, the method comprising monitoring the well using data received from the sensors. 29. The method of claim 28, comprising monitoring the well using data received from the sensors whilst abandoning the well and/or cementing the well and/or suspending the well. 30. The method of claim 28, method comprising monitoring the well during at least one of: cement tests;testing pressures on either side of packers, sleeves, valves or obstructions;and wellhead pressure tests. 31. The method of claim 28, wherein the method comprises monitoring the well when a BOP is in use. 32. The method of claim 31, wherein the method comprises monitoring the well during non-drilling phases when the BOP is in use. 33. The method of claim 32, wherein the method comprises drilling. 34. The method of claim 28, wherein the method comprises inhibiting fluid flow from the well in an emergency situation. 35. A well comprising: (a) a safety mechanism, the safety mechanism comprising: (i) an obstructing member in the form of a packer moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted in order to shut an annulus;(ii) a movement mechanism;(iii) and a wireless receiver, adapted to receive a wireless signal;(iv) an expansion mechanism;wherein the movement mechanism causes the expansion mechanism to activate which expands the packer and so moving the packer from said first position to said second position in response to a change in the signal being received by the wireless receiver;(b) sensors to detect pressure in the well, in the vicinity of the safety mechanism;wherein a sensor is provided above and a sensor is provided below the safety mechanism to monitor differential pressure across the valve;wherein in use, in the event of an emergency situation, a wireless signal is sent into the well to the safety mechanism. 36. A well as claimed in claim 35, wherein the safety mechanism comprises a battery. 37. A well as claimed in claim 35, wherein the wireless receiver is an acoustic receiver and the signal is an acoustic signal. 38. A method of inhibiting fluid flow from a well as claimed in claim 35 in an emergency situation, the method comprising: in the event of an emergency situation, sending a wireless signal into the well to the safety mechanism. 39. A method as claimed in claim 38, wherein the signals are sent retroactively, after an emergency situation has occurred. 40. The well of claim 35, wherein the safety mechanism is adapted to actuate using well pressure acting against an atmospheric chamber. 41. A method of deploying the safety mechanism according to claim 35, the method comprising monitoring the well using data received from the sensors. 42. The method of claim 41, comprising monitoring the well using data received from the sensors whilst abandoning the well and/or cementing the well and/or suspending the well. 43. The method of claim 41, method comprising monitoring the well during at least one of: cement tests;testing pressures on either side of packers, sleeves, valves or obstructions;and wellhead pressure tests. 44. The method of claim 41, wherein the method comprises monitoring the well when a BOP is in use. 45. The method of claim 44, wherein the method comprises monitoring the well during non-drilling phases when the BOP is in use. 46. The method of claim 41, wherein the method comprises drilling. 47. The method of claim 41, wherein the method comprises inhibiting fluid flow from the well in the emergency situation.