If you were flying in a single pilot aircraft there is only ever one PIC under JAA regulations
Correct, but he wasn't flying under JAA regulations at the time.
Can some one give me some guidance in how to validate my hours? Do i really have to make a whole different log book?
What would you need to validate?Why write a new logbook?
Do you have paystubs to prove that you worked at those companies? Can they give you a printout of their accounting system to verify hours flown?
You have your certificates so you have those hours. Do you have a FAA ATP?
If a 135 company requires a SIC and it is noted as such in the Ops Specs you log SIC as it supersedes the FAR's.
If a JAA authority doesn't see it that way there is nothing you can do about it.
But why are you concerned about the CAA? You meet or exceed all the requirements about the issuance of the JAA certificates.
It is how a future employer will look at those hours.
But even then you have the hours and the experience that comes with it, regardless of how you logged those hours and whether they are recognized or not.
Unless I'm really missing they big picture here I wouldn't worry about it.