Please wait a few days to allow for bank holidays or any technical delays especially if it’s your first payment.
We might not take money from your account if you're sufficiently in credit. It's easy to check this:
the bank account details we used didn't match with the bank
there's not enough money in your account
the payment was higher than a Direct Debit limit that you've set with your bank
the bank has received a request to cancel the Direct Debit
the bank account has been closed or transferred to another bank