Today will be the usual day to submit your VAT return for the quarter or month ending 31 March and to make payment.
Consider if that cash can be better used in your business by taking advantage of the deferment scheme from HMRC.
You can defer payment for quarterly or monthly periods ending February, March or April 2020.
If you pay by direct debit, you need to contact your bank to stop the payment.  You dont need to tell HMRC that you are deferring.
You must pay the deferred VAT before 31 March 2021 so make sure it is in your planned cashflow