"I understood from at least one previous poster that their application was solely done online. I haven't time right now to search for the post.
Makes me wonder are they putting up fresh barriers if its now necessary to print & post"
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I did it online and got a receipt, you need to go through the ID process with biometric passport. Not everyone's cup of tea but I found it OK. Advantage is you can see your records, get an immediate receipt and it's quicker to make the application. You also provide all your employment and self employment record. Disadvantage is you can't explain any variations or complexities.
I will post my PRSI record to them and maybe explain that I feel I should have more recorded contributions and am chasing more detail on employers in UK. After that will ring or book a call back on the record of contributions