ORAC, there's also the old HC2a aircraft (six-off) which are the same build standard and Lot number as the HC5s, just with standard tanks. I'd imagine these are likely to also be retained and upgraded to the new standard. We may not have a dedicated RW tanker, but given what these aircraft are and their intended use, the MC-130Js at Mildenhall would be an option, as would the Franco/German KC-130Js.