I volunteer with these guys:
www.high-trees.org
They provide education for adults in things like IT, English as a second language for work etc. I don't actually do any of the teaching, I help on the backroom side but I'm sure they'd be up for any help. I know they're struggling a bit providing the courses in the current climate as a lot of people don't have access to the IT equipment we take for granted and they can't do face to face right now.
They're lovely people, they're just at High Trees, on the way into Tulse Hill.