B
Burger
Yes but you can't turn up at someone's house and show them your acs certificates can you. You have to be registered to legally work as a business, but it also shows your customers you are competent to work on gas.
Yes I get that as well. Businesses whether self employed or not carrying out gas fitting work for financial reward or gain (which is what he’s doing) must be a member of an approved class of persons - currently gas safe.