What secondary schools teach Mandarin GCSE ?

[maisiewaysie]

I'm thinking of moving back to UK from HK within the next year and am searching for a state school/independent secondary school that teaches GCSE mandarin for my son who is now 13 (which is Year 8). Hopefully to find one in the surrey area as I have relatives living in Cheam (Surrey) area. I'm hoping to find one where he can take mandarin as an alternative to French/Spanish etc. So one less language to pick up as he will already have to speed up his English Language knowledge.