http://www.legislation.gov.uk/uksi/1999/664/schedule/made
The Northern Ireland (Royal Assent to Bills) Order 1999
NORTHERN IRELAND
CONSTITUTIONAL LAW
King's Printer of Acts of Parliament
2011-07-04
NORTHERN IRELAND
CONSTITUTIONAL LAW
Under section 5(3) of the Northern Ireland Act 1998, a Bill becomes an Act at the beginning of the day on which Letters Patent signifying Royal Assent are notified to the Presiding Officer of the Assembly. This Order in Council prescribes a standard form for the Letters Patent.
SCHEDULEFORM OF LETTERS PATENT3
Article 2(1)