HMRC have published new guidance Change your VAT registration details.
Updates can be made online but this new guidance provides information about paper form VAT484:
“Use form VAT484 to change your business contact details, bank details and your return dates on your VAT registration by post.”
https://www.gov.uk/guidance/change-your-vat-registration-details
Related content from Claritax Books
Value Added Tax, written by Ciaran McGee MA (Oxon), FCA, CTA, is an extensive volume (over 1,000 pages), written primarily for non-VAT specialist accountants and tax advisers.