PArt 1 registration records details of any shares in a boat as parts of 64. It's a historic thing from the days when sailing ships were owned by big consortiums of people up to a 64th. If you own the whole boat you have 64/64, half the boat 32/64 etc. The registration also includes any details of moneys loaned against the boat. HPI also ran a scheme with the British Marine Federation where new boat sale loans were recorded with them, not actually sure wethere that is still going, think it waas called Boatmark or something.
Cookee I did have a quick look at your ally step off boxes in Cowes and the angle would probably be too tall to waterjet cut, happy to have a go though. You weren't around at the time otherwise I would have stopped to chat, but I will send you a brochure.