Hi username_recreated,
Before deciding to pay any voluntary National Insurance contributions, may we suggest that you apply for a State Pension Forecast which will detail your current and future entitlement to a UK State Pension.
It will detail in any voluntary contributions will be required to improve your entitlement.
You may obtain this Forecast here:
Check your State Pension forecast
If, after receiving the Forecast you decide to pay the voluntary contributions then please call our National Insurance Helpline on 0300 200 3500 and they will be able to discuss with you how to make payment.
Thank you.