Yes Graham. Try googling 'will writers' and you find many advertisements. One firm offers an online ten minute will service!
Can't find any organisation with the exact name given by the poster, to which they say they belong. There is a society of professional will writers and one other with a similar name, both of which say their members can have qualifications; these consist of passing whatever test the society approves of and administers
As it stands, anyone can call themselves a will writer. The 'writer' might be a bus driver or anything else, with no expertise in the law, or trusts or anything pertinent to wills, probate and tax, and no records kept, and, above all no insurance against claims for loss from negligence or sheer incompetence.
Would frighten me, even more than the answers we got from the 'will writer' on here. Even lawyers don't act for themselves; " the lawyer who acts for himself has a fool for a client" is the old saying, because they've nobody to sue if the case goes wrong, among other reasons.