If it is not certified, it might be that he is not a Competent Person, in which case Trading Standards ought to be involved.
When you say "well rated" do you mean on one of those websites where the trader, and his friends and relations, can write multiple glowing reviews using false names?
When you say "well rated" do you mean on one of those websites where the trader, and his friends and relations, can write multiple glowing reviews using false names?