RAF, which (in a couple of years!) will operate Typhoon and C130J (2types, probe); and E3D, Rivet Joint and C17 (3 types, Boom refuel only) orders wait for it...
As for the other heavies, the answer's simple - along with with so many other things these days - We don't need it now, so we don't need it.
E3D, C130J and C17 all seem to do their thing pretty well without them (with the odd exception for E3D vs USAF tankers, but that's more out of convenience).