There's a lively forum that's free to join at http://ottfilms.co.uk/ with a focus on getting together and making films under the ott banner. As you might expect it's highly focussed on London, but there is a smatterring of people from other regions. They meet monthly or so and they have quite a prolific output of microshorts with pretty good production values. Worth a look if you're near London and fancy getting a project made under a co-operative or contributing to existing projects.