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// Not sure if this was ever resolved but a couple of years ago the banks where told that admin charges had reflect what it reasonably cost them so in most cases that would be very little //
Yes, that's what I thinking of 3T.
// I had a similar experience with Santander, a debit payment of £3.00 was honoured (even though I shouldn't have been able to exceed the limit on my account) which resulted in £80 of charges. //
That's it chelle. She has no authorised overdraft facility, so as far as I'm concerned they shouldn't have honoured the payments.