I hope this is helpful and answers your question.
If you have any other questions, please ask me before you rate my service – I’ll be happy to respond.
Can I do this online tomorrow so that it takes immediate effect ?
Thank you for your reply.I suggest you try it tonight or tomorrow morning and if it does not work, then post the completed form to HMRC recorded delivery and retain copy for future reference.
This assumes that you activated the Change registration details service when you first registered to file VAT returns online.A change to April would mean you file the VAT Return no later than 7 June.I hope this is helpful.