Instead, the MoD has agreed to lease 14 Voyager refuellers at a cost of £750m each over 27 years up to 2035 - a total cost of £10bn.
plus £10M, so that"s £760 divided by 27, about £28M a year or £2.3M a month or £500K a week?
They are supposed to be on standby for use in war, but equally the cost was to be defrayed by using them in the civil charter market - both now impossible to imagine. It just means the cost is being hidden/absorbed in the MOD budget (as are just about everything the government can disguise as having a "security" connotation).
Frankly, they could wetdamp/dry lease an A330 for far, far less, the fuel economics making them unattractive in the airline industry, but irrelevant for the few trips flown by a VIP jet - but then the cost would be public and upfront