While this is a source of funding from NESTA, and, will have the requirements that NESTA uses to assess the success of a project, they are funding collaborative projects, so it may be worth a look when the call for applications for the next funding round is announced,
The latest projects funded can be found here, ShareLab | Nesta
Considering the remit that ShareLab has, they would be another source of funding for co-operatives.