Andrew (your #12470)
he was posted to RAF Feltwell in February 1944 and appears to have stayed there until being sent to No. 4 PDC in May 1945 - but we don't know what he was doing there, so have no idea what his trade was
4 PDC is a Personnel Despatch Centre
I've checked my Service Record and when I was posted to S. Rhodesia in 1951 immediately before departure I attended 5 PDC at Hednesford in Staffordshire where one was kitted out with tropical kit etc. Record also shows that in 1956 before departure for the Far East I attended 5 PDU (Unit?) which had moved to Innsworth in Gloucestershire.