Hi Jonathan Gregory,
You cn pay voluntary contributions to the UK scheme from abroad.
To apply to pay National Insurance contributions abroad
• go to
www.gov.uk and search NI38
• read the guidance on social security abroad: NI38 and the landing page.
• fill in and send us the form CF83 Application to pay National Insurance Contributions abroad. This can be completed online or by print and post.
If your application to pay voluntary National Insurance contributions abroad is approved, we will write to you to tell you and confirm payment dates and amounts or we may ask for further information.
Thank you.