The Mandate would be submitted to BACS.
The Mandate would be transmitted to the Bank from BACS.
The Mandate would be available on the account.
Also the earliest day you could submit a payment file for that Mandate.
Files are delivered by BACS to the settling banks.
Also and rejections for the mandate would be delivered to the Merchant.
The day the money changes hands in the bank accounts.
Also the day 99% of rejections for the payments are returned to the Merchant.
The day 1% of rejections for the payments are returned to the Merchant.
The day any failed transactions are revered from the service users account.