I know nothing about scanning in Northern Ireland, but here's what I can tell you:
In England all police use a type of digital radio system called Tetra. Your scanner can't receive Tetra transmissions, and as far as I know no current scanner can. I don't know if they use the same Tetra system in N. Ireland, but it's quite likely they do. I looked in the Radioreference database and did not see any frequency information there for other services, such as Fire Departments, in N.I. That database is completely dependent on users uploading their radio information to it and most users on RR are in the U.S. so it's not surprising there is no Ireland data. You might have some luck if you Google around for "Northern Ireland scanner frequencies" or something similar to see if you can find some information on frequencies in use in your your area. Also be aware your radio is analog only, and does not Trunk Track, so that may greatly limit what you are able to receive with it. One thing for sure you could receive, assuming you are near the coast, is VHF analog Maritime radio traffic. Wikipedia has a page that shows the UK Marine channels, which you could easily program into your radio directly using the radio's keypad.:
Marine VHF radio - Wikipedia
Also you should be able to monitor quite a lot of Air Traffic control, especially if you are near an airport. But if you're not near an airport you'll still be able to hear lots of planes as they can be quite a long distance away. It's not uncommon to pick up a jet airliner at 35,000 feet transmitting to an ATC controller on the ground when the plane is 75 miles or more distant.
Here's a page with some info on your scanner, including links to some programming software:
https://wiki.radioreference.com/index.php/BC125AT
Hope that helps.
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