Just Google National Citizenship Challenge, or NCS, or go here www.ncsyes.co.uk/ and look for programmes near to you.
The one my DD did was fantastic, and was £35, which was refundable on completion of the 4 week programme for full attendance.
My feedback to the programme was that it's marketed directly to kids via FB, Twitter etc etc, and sometimes presentations in schools. It should also be marketed to parents and teachers, and youth group leaders. I only got to find out about it by chance - received an email in my Guiding capacity which mentioned some places left.
DD was reluctant to do it, but I spoke to parents of her friends, and we took a few of them to meet the person organising it locally, and more or less forced them to sign up there and then.
DD REALLY didn't want to go, and only went on the proviso that I'd go and fetch her after 48 hours if she hated it, but I got a text at the end of the first day to tell me it was brilliant and she loved it!.
Best thing David Cameron has ever done, IMO.