Open the passport from the front and look at the very bottom of the first page on your right. The passport number can be found here in bold numbers.
Look at the very top of the first page and you will see the passport number has been perforated across the top of the page. This has been done across the top of all the pages of the passport.
Open the passport from the back and turn back one page. This is page 31 of the passport, the page containing the holder's details. It is very stiff as it has the security chip in it and is laminated.
Turn the passport so you are looking at it in a landscape position. The passport number can be found in the top right hand corner to the right of the code and directly beneath the words 'Northern Ireland.'