Dinghy Plans Uk I Am Planning To Start A Sailing Course In London But I Am A Bit Confused..?

I am planning to start a sailing course in London but I am a bit confused..? - dinghy plans uk

I would like an approved RYA, but I do not understand the union running courses, credit courses only by other private companies run / clubs. Is that correct?

Also, I am a little confused about the different types of courses. For example, a course for sailboats suitable for the navigation of a large boat (42 feet)?