Bath, Swindon, Wiltshire and NE Somerset
CAMHS website for services in the Bath and North-East Somerset geographical area here
BANES CAMHS is based in Keynsham and there is a nice video on the link above, which shows you what it looks like.
Services near Bath, Melksham, Swindon, Marlborough and Salisbury: This page will take you to their contact details, parking and transport:
CAMHS services for South-East and South-West Somerset are detailed here with some videos and photographs here