SolvedVATREG35400 | Changes affecting registration: change of bank details - written notification awaited
From HM Revenue & Customs · VAT Registration
If you become aware that a trader’s recorded bank details may be incorrect, issue a VAT 25 to obtain confirmation of the correct details.
At the same time:
any existing bank details must be deleted
for Annual Accounting traders, action as normal but refer to the guidance in VATAAS. (External users can find this guidance at http://www.hmrc.gov.uk/manuals/vataasmanual/index.htm).
If the trader does not reply, no further action is required.