100 Pounds Sterling

Bank of Ireland's £100 note occupies an odd position in the Northern Irish system: the bank is incorporated in the Republic of Ireland yet has always retained the right to issue sterling notes in Northern Ireland, a quirk of the retained issuing privileges grandfathered through successive Banking Acts. Unlike Bank of England notes, Northern Irish banknotes from commercial banks are not legal tender anywhere — not even in Northern Ireland itself — yet circulate freely by convention and mutual acceptance.

De La Rue printed this at their Dunstable facility, though distribution was managed through Belfast. By 2005 the £100 denomination saw almost no retail circulation; the note functioned primarily as a large-value store and interbank instrument.