The C.1s were delivered to the RAF from July 1966 to August
1968 to fulfil the role of transporting military personnel and VIP's to locations around the world. They also can perform Aero-medical Evacuation duties as and when required, when they can carry up to 76 stretchers with six medical attendants. The C.1 can carry 150 passengers and has a crew of four with an unrefuelled range of over 3,600 miles.
From 1991 to 1996 Flight Refuelling converted the C.1s to C.1K standard to enable them to air to air refuel. Two Mk.32 wing mounted refuelling pods with an under fuselage CCTV camera, were the principal modifications carried out. Without any extra fuel tanks installed, the aircraft continued to have the same capabilities as before, and really only air to air refuel when transporting passengers over long distances.
By 1982 BAe Filton had completed conversion of a number of ex civilian airline VC-10s to K.2 and K.3 standard. Five ex-British Airways Super VC-10s were later converted to K.4 standard as the Victor K.2s were gradually being phased out. 101 Squadron was reformed in 1984 to operate the 'new' VC-10 tankers. Up to the disbandment of 10 Squadron, 101 Squadron has a different role to 10 Squadron in that it is responsible for all the air to air refuelling of Britain's fighters, throughout the UK Air Defence Region and on exercises around the world. A 101 Squadron VC-10 is on permanent standby at Brize Norton and can take to the air in just 15 minutes. The VC-10 K.3/K.4 variants have three refuelling points, comprising of two wing hoses and a single fuselage-mounted refuelling point.