Getting proof of NI contributions in UK to fill PRSI gap?

Hi, I worked in the UK for about 3.5 years back in the 1990s.
How do I get proof of National Insurance Contributions paid there so I can get my PRSI record updated?
As I was a parent in the home for a spell my PRSI contributions here are a bit short for the Contributory pension.
I know there's the form that you request to make NI contributions towards a UK pension but I'm thinking that's not it.

You may be better off paying voluntary UK NI contributions backward to get a full or close to full UK state pension.

Have a look at this thread.

In the meantime to learn about your NI record write to HMRC and include your NI number, details of UK addresses, etc.

National Insurance contributions and Employers Office
HM Revenue and Customs
BX9 1AN

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