"Most tax advisers are already regulated by professional bodies; they are competent, trustworthy and reliable.
"Nevertheless, HMRC is clearly concerned by the poor standards of behaviour adopted by a limited number of rogue advisers."
Mr Bull said it was in the interests of "clients, honest advisers and HMRC" that all paid-for tax advice is delivered by advisers whose "ability and standards of conduct are beyond doubt".
He added: "No amount of new powers for HMRC can achieve this. Public and consumer confidence in tax advice could be undermined by any lack of competence, quality or service in unregulated tax services, and the absence of any protection in respect of them.
"It would therefore be in the public interest for all tax advisers to be subject to independent regulation by professional bodies."
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