Looks to me it would be something similar to
this or one of
these. Granted the first link is to an ATPL confirmation form, but I've given you enough in those two links to at least work with.
What the examiner means is that you can't just log 200 hours and attempt the flight test. You have to prove that you actually meet all the pre-requisites, such as the VFR cross-country flight or the variable pitch prop and retractable landing gear requirements (assuming you're in the UK as you say you're London based). That's what the form(s) will do. The best thing you could do is go into your local flight school and ask the question to them. They'll be better able to validate your experience against the regulations than an anonymous person on the internet.