British Airways Boeing 777-236ER G-YMMA operating BA218 Denver – London Heathrow (depart Denver 8th March) diverted to┬áSt Johns, Newfoundland in the early hours of this morning due to a medical issue on board. However the aircraft then encountered a refuelling issue and when this was rectified crew did not have sufficient hours to reach London. The aircraft has therefore nightstopped at St Johns.