DM,
If the RAF does not do helicopter AAR....that would leave the Army....or Navy to do the mission it would appear. The Army got rid of it's Austers a long time ago and I can't recall the Navy ever having such a capability.
If by "inter-service" you actually mean "international" then perhaps we both agree. Perhaps that is demonstrated in the photographs where the Italians provided the Tanker.
SpecOPs capability must be constrained by that situation.....having to go hat in hand to outsiders for that kind of assistance.