you just set up in business and no it is not regulated.
Company formation agents often offer other services. It may be that some of these services would constitute giving legal advice, which is of course highly regulated. but in such cases, they refer to solicitors or barristers as appropriate.
I think that some of the add-on services they offer could be generically described as being 'Company Secretarial' in nature, and I think there is an institute of some sort for Company Secretaries - though I do not think there is statutory regulation of their work. I am open to correction on this.