Sort code
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Sort codes are a unique identifier to the particular office (branch) of a bank which holds bank accounts. They are typically used in British banks, although other countries use similar identifiers. The numbers are six digits and usually seperated by hyphens (e.g. 12-34-56).
Some branches contain sub / child branches which will be identified by the parent sort code rather than a unique one.
Most banks print the sort-code of your initial branch on your debit card or cheque book.
A variety of reference guides exist including your own bank who should be able to look up the information for you if necessary.