Mark Lee, Chairman of the Network tells us that invariably the right choice for anyone not sure, is to register as a tax accountant. But you may want to check the FAQs for both tax advisers and tax accountants to be sure. 

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FAQs for tax advisers -  https://www.taxadvicenetwork.co.uk/tax-adviser-membership/faq/

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FAQs for tax accountants - https://www.taxadvicenetwork.co.uk/tax-support-for-accountants/faq-for-accountants/