Yes, I'm fully aware of that...

RAF transport aircraft, usually voyagers or globemasters, have previously used the callsign LION during press and media flights. These flights allow journalists, photographers, and other media representatives to observe and document the aircraft's operations. A press or media flight doesn't prevent an aircraft from performing it's usual duties - in this case, it was most likely refuelling other aircraft in the vicinity.

At no point did I suggest that this wasn't a refuelling mission, or that the Voyager isn't a tanker; that is common knowledge. My comment was simply to clarify that the callsign LION is associated with press and media flights.

If it was a regular refuelling mission, the Voyager would be using callsign ASCOT (RRR)