Hi there thanks everyone for answering my questions
And Matt in answer to your question I'm a student at Brunel near Windsor, counts as a London uni. I am looking at something a bit different for my project, makin the seat tube the lock, sounds a bit gadget like but its an interseting project even if it wouldn't sell! In England a lot of thefts occur when people dont lock their bikes at all. This way they will always have their lock and also it stops the seat theft.