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Suppose you bank with Barclays but visit a supermarket that banks with
Lloyds. To pay for your shopping you write a cheque against your deposit at
Barclays. The supermarket pays this cheque into its account at Lloyds. In turn, Lloyds presents the cheque to Barclays, which will credit Lloyds' account at Barclays and debit your account at Barclays by an equivalent amount. Because you purchased goods from a supermarket using a different bank, a transfer of funds between the two banks is required. Crediting or debiting one bank's account at another bank is the simplest way to achieve this.

custom officer has already checked their luggage.