Missing NI contributions - NI38/CF83

Hello, I hope this question is now in the correct place to ask, and makes sense? I worked in UK and have 24 years full NI contributions. I moved abroad in 2006 with full time employment from the start. I am still living in the same country. (so I have worked 17 years abroad in full time work - paying contributions to country of residence) From my forecast, I need another 8 years of NI contributions to obtain full pension. Looking at the missing NI years, it averages 850 pounds per year. (approx 6800 pounds total) Is there any way to reduce the amounts per year, or a way to pay the outstanding amount on a monthly basis? I have looked at NI38/Form CF83, but not sure if relavent for my request? Am I class 1 or class 2? I am not sure Thanks for any advice/help/pointers regards

Hi Ian Macdonald,

If you would like to pay voluntary National Insurance contributions for the period that you are overseas, then please complete and return our CF83 application form after reading leaflet NI38 ‘Social Security Abroad’.  
The NI38 and CF83 can be found at the following weblink:  Social Security abroad: NI38
Voluntary class 2 contributions, currently £3.45 a week, maintain a National Insurance account for State Pension purposes as well as for claims to Employment & Support Allowance made in the United Kingdom.  Voluntary class 2 contributions may be paid as long as the individual is employed or self-employed overseas and were normally employed or self-employed in the UK before their departures.  There are additional criteria but our International Team will be able to assess this for you.
Voluntary class 3 contributions, currently £17.45 a week, maintain a National Insurance account for State Pension purposes.  You do not have to be employed or self-employed to pay this class and additional criteria is involved but again our International Team will assess this for you.

Thankv you.