The CAA are being kind to you by ignoring the statement in your letter regarding the failure to complete the requirements for revalidation.
I don't think so. I knew I was legal as I had the signature on the CoR page. I admit I was partly to blame, but in the two times I have got my license revalidated by experience, twice it has been messed up. At least the examiner might have mentioned that the form was required, in which case I would have gladly supplied one.
I used an examiner I didn't know, I popped into a well known school on the South coast and asked to speak to one of their examiners and asked him if he could revalidate me. So he checked my logbook, and duly signed. It was only later I realised.
As far as forging goes, the point was that the CAA had my logbook and my license and were perfectly at libity to checkup if they wanted to, which is why I asked them to update their records. Even a brief look at my logged times would have confirmed to them (as it did the examiner) that I had ample time and all the requirements logged in the correct time scale.
I was also legal by virtue of my FAA ratings, so sometimes I wonder why I bother keeping the JAA ticket running......
Cheers