Firstly, a word of thanks for the original posters on this topic and the many helpful posts thereafter.
In case it will be of use to anyone, my experience so far is as follows:
- I had 3 years of NICs (the bare minimum I think) from my time working in the UK. In April I filled out the CF83 etc and received confirmation from HMRC in May that I qualify to make Class 2 contributions.
- In July I paid an additional 7 years of NICs back to take me up to the minimum 10-year threshold. My (flawed) thinking here was to bring my total years of contributions up to the minimum of 10 before seeking confirmation from the Pensions Service that further payments would increase my state pension (as seemed to be the advice in the correspondence from HMRC).
- 22 weeks later and my NI record has still not been updated online. The rep that I spoke to today advised me that as long as the money is in HMRC’s custody by the deadline of April’25 rest assued my contributions are valid, regardless of how long it eventually takes to update my record on their end (29 weeks from today will be July'25).
- So, rather than wait any longer I decided to pay all of the rest of the shortfall today (with another Revolut transfer) which should bring my number of full years to 21. Based on the 29 week waiting period, the second payment should be reflected in my NI record around July'25.
- My next task will be to find out how future annual contributions can be made, but that's for another day.
Bit of a rollercoaster this, but well worth it in the end I hope. Thanks again for the many informative posts on this topic.