Summary If you lived in the UK for at least three years and worked there for at least some of this time. You can make backdated contributions of National Insurance for up to 18 years which will cost you either £163 for each year purchased or £824 for each year purchased. The UK state pension...
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In short, you should qualify for class 2 for every year since 2006 you've been working full time since leaving the UK.
If you devote a bit of time to reading the thread above you will know as much as the majority of us who have used it.