I want to recommend a brilliant after- school/holiday club in west London- School of Comedy. They take kids from age 4 through to 16( in different groups obviously!) and let them explore comedy through improv, comedy sketches, lots of fun games etc. It's unique - you don't need talent, you don't need to be sporty or musical you just need loads of enthusiasm. The team that run it are passionate about letting the kids build confidence and be themselves at all times. It helped my son through a difficult period of anxiety and depression - the only place he felt accepted. Can't praise enough!