I think its great to be able to support a charitable project by doing something so trivial as drinking a coffee. In London you have 2 very nice possibilities of doing so:
1- Kahaila Cafe
Kahaila is a charming café in London’s infamous Brick Lane, located in the artistic eastern district of Shoreditch. If there could be anything better than their amazing selection of cakes and sweets it’s that they are a charity that supports a range of local community projects and charitable causes, including Luminary Bakery, a social enterprise giving employment opportunities to vulnerable women. Everything about Kahaila is ethical, from their fair trade coffee to the locally sourced ingredients in their yummy fresh sandwiches.
Address: 135 Brick Lane E1 6SB London
2- CanDo Coffee
CanDo Coffee is a social enterprise designed to enable disadvantaged and socially excluded people to become self-employed independent street traders. They have pop up coffee vendors at various locations across London including Hyde Park Corner, Paddington and Regents Park where you can pick up an ethically traded coffee while supporting the local community. Since 2015 they reinvest every penny of theirprofits into the CanDo Foundation (parent charity) to provide social support and rehabilitation for the people.
Address: They have 2 locations https://www.candocoffee.com/locations/