In November 2015, it was announced that an RAF A330 MRTT would be refitted to carry government ministers and members of the Royal Family on official visits.
The refit would cost £10m but would save around £775,000 annually compared to the current practice of chartering flights. The aircraft, nicknamed "Cam Force One" by some in the media, will be fitted with 158 seats.
The aircraft entered service on 6 May 2016, with the then Prime Minister David Cameron making his first flight on it to visit the 2016 Warsaw summit.
From:-
Air Tanker.