Hi there
In relation to the State Pension .. I understood that to qualify for a full pension .. a minimum of 30 years contribution was required & 'top ups'/payments were only an option whilst you're still living in/employed in the UK?
I've been on the government website & it seems that contributions can be made periodically.. for that reason I plan to leave £ behind in a bank account to drip feed payments into this until I've achieved the 30 year threshold.
Cheers