FWIW, that's mostly a non-issue because of the Direct Debit guarantee:
> If an error is made in the payment of your Direct Debit, by the organisation or your bank or building society, you are entitled to a full and immediate refund of the amount paid from your bank or building society
> If an error is made in the payment of your Direct Debit, by the organisation or your bank or building society, you are entitled to a full and immediate refund of the amount paid from your bank or building society
https://www.directdebit.co.uk/DirectDebitExplained/pages/dir...