I know about the VAT in the Republic, and collecting the forms to turn in at the airport, but do they have a similar program in N Ireland? I wasn't sure since I believe the VAT is an EU thing.
VAT is the same in the UK and No. Ireland as in Ireland. They all belong to the EU even though GB does not use the euro. Before making purchases in No. Ireland ask if they participate in the refund scheme. They may need your passport for the form.