British Army Equipment in the Later Twilight War

[waiting4something]

I got a question. Why does Ireland use a different rifle then the rest of the UK? I mean Ireland is still part of the UK, so why don't they all use the same stuff? If Twilight 2000 would have happened would they still be using L1A1's instead of the the AUG? Would they go with the British flow and use a L85? Or would they get the AUG anyway? What's the deal?