A MAN was taken to Derriford Hospital by Devon Air Ambulance on Friday after a collision at Iron Railings, between Chillaton and Tavistock. Two fire crews from Tavistock and one from Launceston attended the scene at around 10.30am and found the man in a critical condition after a two car collision on the cross roads. The man was taken to hospital by helicopter with suspected life-changing injuries. Police were in attendance.