HMRC have updated their guidance on VAT deferred between 20th March and 30th June. Under the initial scheme any VAT deferred was payable in full by 31st March 2021.
There is now the option to pay in up to 11 monthly instalments. All instalments must be paid by 31st March 2022. To use this instalment scheme, you will need to apply before 31st March 2021, you will be able to opt in online early in 2021.