Future Commando Force (deliberately) changed the game for amphibious vessels: forward deployment of RM units on forward deployed vessels, MRSS/Littoral Strike Ship, and yes, some deployment as part of a CSG. Not to mention RFA (and RN) recruitment and retention affecting the ability to crew the existing vessels..
Anyway for the sheer hell of it, here's RFA Mounts Bay in the vicinity of Southampton Ocean Cruise Terminal at the weekend (quality due to zoom on phone through a dirty window)