Finding some funding for a short film is probably one of the hardest parts of making the thing. As you are in the UK you could approach the British Arts Council, or apply for Lotto funding. Looking at these images I can see you have a good eye for style... but these kind of organisation probably look more for concept and story idea (Though that is my own assumption, I could be very wrong here). If you have a fully developed idea then give it a go!
I really like this little guy and want to see the idea fully realised
I'm also interested as to how you go, as I too am hoping to put together a short (nothing too major as there are only a couple of us working on it)
Good luck.