Don't know what the one you've already approached is, but what about considering something which does really good work with young people in Swindon.
We have lots of posts on here about what needs changing in this town, and disaffected young people etc
What about something like the SMASH project?
http://www.smash-youth-project.co.uk/
I have had some connections with them previously though work and there were issues with funds at the time. It might be nice to support a group who are doing something positive and proactive with young people in this town?