GamesAid works with the games industry to support smaller charities - organisations which don't necessarily have so many resources or such a high profile. Here are the charities they're currently supporting - organisations which support life-limited children, young people at risk, bereaved children and disabled gamers. 

http://www.gamesaid.org/gamesaid-enjoys-record-breaking-2014-with-438k-raised/

I'm a father, I'm a game developer, I'm an ex-teacher, and I would love to be able to provide more support for all these causes. I'd be hugely grateful for your help.

This will be my second marathon. There are a couple of complications to this one: I'll be getting off a transatlantic flight the day before, and attending the Game Developer's Conference in the week immediately after. But it's a theme, right?