techboy, I had the same 'misunderstanding' to over hours, I phoned the FCL person at Gatwick, she said that 5 hours sim time could be credited, I was 8 hours short, so had to jump in a tommy for 3 hours.
CAA should be able to clear it up for you with a quick call as they take photo copies of your log book.
I had to send back log books after the 3 hours aircraft time, and a letter stating which sim sessions/time I wanted to credit towards the 200hrs.