List of major banks in UK

HSBC BANK PLC (2515)
LLOYDS TSB BANK PLC (2413)
Halifax (2393)
NATIONAL WESTMINSTER BANK PLC (2391)
THE ROYAL BANK OF SCOTLAND PLC (1044)
Bank of Scotland plc (998)
BARCLAYS BANK PLC (666)
THE CO-OPERATIVE BANK PLC (396)
CLYDESDALE BANK PLC (380)
BANK OF ENGLAND (375)

What is Sort Code?

A Sort Code is a unique number assigned to each bank in UK to identify the bank branch of the customer's account. Sort Code is unique bank and branch identifiers used in the UK. SORT Code is three pairs, six digit number. For Example: 123456 or 12-34-56
Sort Code is must to transfer money between the banks. Sort Code is also needed to make a payment through wire transfer. Along with Sort Code, person or organization's account name and number is must to transfer the money between the bank accounts.