Ok well this should get ye olde grey matter working as the MOD haven't got a scooby. My Grandad's service record finally arrived the other day after some mishaps and he has two service numbers. One has been scored out on the photocopy of his service card and above it the other one written. Now I know FX777895 means he was in the fleet air arm but I knew thata to begin with but the original number he was given doesn't relate to the interpretation leaflet info I was sent along with his record at all. It is SFX837. no port division letter, the same FX that presumably relates to the fleet air arm still as he was with the air ministry after the war but the records don't cover this so I don't know that that would have any bearing. He volunteered in 1940 and something happened which looks like he was 'transferred from S.S. to H.O. engt (?)' and of 11.12.45 something else happened which looks like 'wide' or could be 'made' I guess 'Off. No L/FX777895'. He was Temporary Acting and then Acting Lead Airman until 1943 then Temporary Acting Petty Officer intil 1944 and then Temporary Petty Officer until 1945 where he became Temporary Chief Petty Officer and was released to shore in April 1946.