Have you had a look at these (not that I'm recommending, but might be worth a look)?
http://www.angelinvestmentnetwork.co.uk/home http://www.venturegiant.com/ http://www.angelsden.co.uk/
I believe Business Link also run a similar scheme but I generally stay well clear of them, I've yet to see anyone from Business Link try to do anything other than sell me more Business Link stuff I don't need.
Best of luck.