Lost National Insurance Number - No Reply from HMRC

All,

I am struggling to find my national insurance number. I worked in the UK in the late 90's early 2,000's. I followed the steps in the key post above but my number was not retrievable on the online tool. I wrote to HMRC following the instructions given on the 11th of December with the copy of 2 forms of my ID etc but have not yet received a response. I sent the letter by registered post. Im at a loss now as to what to do. Given Im based in Ireland, are HMRC required to reply to me. It says on their website that they will respond in 10 working days and its now over a month?

Any suggestions would be great.

I received my NI number (in early 2024) after a similar process to the one you've undertaken. It took between 4 and 6 weeks. I can't remember exactly.
Don't lose heart yet.

Thanks that is very helpful to hear.

I posted an NI request form out on 07 May 2024 and received a response by post in the week of 17 June 2024. So about six weeks. I hadn't registered the letter, and was starting to wonder if it had been lost.

I'm in the same boat. Sent my stuff just before Christmas, gonna call tomorrow to try and confirm receipt

Thanks for all your responses. Fibbernacci let me know how you get on with them on the phone.