Hi kob,
I was at TNA today and had a look at the two references you provided. No luck in answering you specific questions. The first piece, WO315/39/5 just deals with the high level policy, deciding things like how many days in a particular theatre or operation should count towards a medal. There are no individuals named that I could see.
The second piece, WO 315/52, is huge - about 2 inches thick - and there was no way I could study it all in the time available to me. Subdivision /7 within the overall file was relatively small and again was concerned with policy, not the actual enlistments of soldiers. There were long lists of individual (some over 400 names long and not in alphabetical order) in other parts of WO315/52 and I scanned then for his name and didn't find anything. They were mainly lists of individuals whom the Russians were pressing the British to 'release' to them on the grounds that they were Soviet citizens. The vast majority of these men were refusing to go back to occupied Poland. There were also lists of Polish officers who had served with SOE, but again, your man didn't feature among them.
I saw absolutely no references to Peterborough or RAF Spitalgate, or even any specific camps, but to be honest I was speed reading hundreds and hundreds of fairly dense documents, with around a quarter being in Polish so not much chance of making out what was being discussed.
