Babby, .
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1. State Pension & Prsi from ROI.
Rules have changed a bit ,so suggest try this,
If you have 10 years + on prsi you will qualify for ROI part state pension even if you stay in Uk. Qoute your prsi number and write to social welfare in Buncrana and ask for print out of your current contributions, you will then know the situation.
If you can ,and I think you can , it should make very good sense to get over the 10 year contribution threshold.
Every year above 10 inreases ROI contributory state pension.
2.State Pension under Uk National Insurance, again try to get to 10 years + ,ie even if you come back home in 5 years see can you (buy) UK contributions.
3. Private Pensions you already hold . Make sure you keep details and advise company of new address.
Wish you & yours well.