Not of interest to everyone here, but for any French lurkers on this site such as myself: if you have young kids, there are weekly French classes at Stroud Green School for them on Wednesday afternoons.
They currently have spare places for next year.
My 6-year-old goes, and he loves it (it's for kids who speak some French already though).
Here’s the link:
http://www.ecoledespetitsloups.com