Any help would be much appreciated.

Any help would be much appreciated.
Hello Will
the VAT return become close when you get the info form HMRC, we don't control it direclty
When you send the new period and you receive the message back it should contain the info also to close the period before, if this doesn't happen this depends from HMRC
As workaround, using the rapid start tool you can export the record into excel , modify and import back
Hope this help