I think the only way to do a film realistically is to make it yourself unless you've developed some serious contacts.
A friend of mine has made some progress in Hollywood and has a UK script in the early stages of production but he's spent 10 years of being messed around something rotten to get to that point.
Film is an insane area. Someone in the Comedy Unit in Glasgow told me they'd spent 7 years trying to put together a £1.5 million budget and still couldn't quite manage it and this is one of the biggest prodco's of them all.