Does the BBAN format follow the format specified for this country?
A sort code is the name given by both the British and Irish banking industry to the bank codes which are used to route money transfers between banks within their respective countries via their respective clearance organizations. Banks in Northern Ireland can be part of either the British or the Irish clearing system, depending on their country of registration. Sortcode Introduction
This guide provides details of the format of the Industry Sortcode Directory(ISCD) data that is publically known as a bank sortcode. One of the design aims of the IBAN was to enable as much validation as possible to be done at the point of data entry.