I'm certainly not an expert on the generalities of finding out RAF personnel's history but in the context of the narrow field I have become interested in of late, and assuming the person was in 293 Sqn, then a place I start with would be the notifications of personnel on the squadron which were regularly submitted to higher authorities together with notifications of movements in and out of the squadron. They are in the ORB's and the appendices. Generally the service number would be attached to the person's name . Even in the logs of missions flown the service numbers are sometimes given - that's how I found out the Canadian and NZ service number of those I was researching.