If you are old enough to remember Big Joe Kernan and Jimmy Keaveney both scoring 2 goals in the same AI final then you should attend to your pension. There is an article in the Sindo today about this.
If you are from the 6 counties or worked there or in Britain and have not been working there for the last couple of decades then you can buy UK State pension contributions from 2006 until July, after that you can only buy 6 years. So this would suit people who moved away or people working in England etc in the past. This would be like buying an index linked annuity from age 67 except it is only a fraction of price. You only get paid from age 67 but then you could get the cost back in less than 5 years and if you live for another 20 years you'll liberate the UK exchequer of quite a bit more than you paid.
Check out your present situation
https://www.gov.uk/check-national-insurance-recordyou can use a passport for ID purposes and it helps to have your old national insurance number to hand.
Worth checking if you are somewhere near reaching the age required and haven't been working in the UK lately, but did before 2006.