Social networking video site - UK developer needed

We are looking for a UK based developer to be part of a very exciting project. The site is to be based around a Facebook build (user registration, friends list, messaging, wall posts) where users can upload images/videos and comment/rate them respectively...(like Youtube)... the videos would also be shown on the user profile as thumbnails. A group function is required similar to Myspace where users can create their own group e.g "London group" and upload videos here. We want the site to have access for iphones/mobile web, use video and standard advertising and be built using a bespoke system, not Joomla etc. The videos are likely to be sent in various formats so would need to be converted just like Youtube. Again, UK developers only as we want to meet face to face with those that are interested. Any other PM' received will not be considered as this is not suitable for our setup.