any social groups in south west of London for high functioning ASD teens?

My 17 yo son is going to university in south west of london sometime next year.  We live in a tropical country and it will be his first time to live oversea.  He is very anxious about going there that he won't be able to make any friends in the university and end up being lonely.  My son is very social.  He loves Lego, anime, games and explore new places.  If anyone know places where he can join social clubs in London, I would be appreciative.  Sorry for my English..it isn't my first language but my son speaks perfect English. 

Thank you

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