PFI - 'Poms are F*cking Idiots!'.
So which of the 7 x 2-point KC2, 5 x 3-point KC3, 2 x 'fitted for' KC3 Voyagers, none of which have either receptacles or probes, would be fitted with booms?
Training up UK boom operators from scratch wouldn't be the only training issue - maintaining proficiency would be another significant problem.
As for taking on fuel using the 'reverse flow' technique from USAF tankers, does the KC-30A have that capability? Or would it be another UK-only requirement if the Voyager didn't have a receptacle?
Modifying the mission system wouldn't be much of an issue though, given that it still doesn't work anyway....