Pinched from fightercontrol.co.uk:
Current Operating positions:
Updated 27/07/21
RAF Mildenhall:
Voyager ZZ331
Birmingham Airport
Voyager ZZ337
Gatwick Airport
Voyager ZZ333
Stansted Airport
Voyager ZZ335 currently on its way to RAF Akotiri.
RAF Fairford
C-130J ZH866
C-17A ZZ178
A-400M ZM412
Oxford Aiport
C-130J ZH872
PS Another Herc was operating from Little Rissington but I believe this is now the one operating from Fairford.