Originally posted by d000hg
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So although the account number *may* be the same, the combination with the sort code won't be because the Modulus-11 weightings will be different and generate different checksums.
I'm losing track of it myself now. You can read all the gory details here.
Validating account numbers: UK modulus checking
Bacground info here : http://www.vocalink.com/payments/pay...-checking.aspx
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