NutLoose.
The VC10 Tanker captains never got automatic Sqn Ldr rank and around the time 101 was reformed several of the shiny 10 captains indeed went back down to Flt Lt as they were only holding acting rank. The 101 crews like to think that ( quite rightly in my opinion) they brought new thinking in VC10 operating to an already very safe fleet which has enabled it to continue so effectively for so long.