http://www.charitiesdirect.com/
There's
thousands of charities listed in the above link, you can even do a search by 'charities aims' which will help match them to your cause. Some charities only support groups, many others only support individuals.
http://www.charity-commission.gov.uk/
You
may also find this second link useful in getting a bit more background information on any charities you're interested in. Remember that many of those listed in both these links actually call themselve Trusts or Foundations, not necessarily charities. Good luck.