VAT Rate Change

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Hi All,
we recently had a change in VAT (GST) in the UK. Our idiot government
only gave us 1 week to alter everything, but with all the other stuff to
be done I've finished up with invoices/receipts to be process from
before the change.

Is there anyway of changing the VAT rate temporarily for the current
document without changing the system set-up? Also, if I do change the
VAT rate back temporarily, are there likely to be any knock-on effects?

Cheers
Richard