Hi Louisa Spencer,
The only credits available would be those through receiving Child Benefit for a child under the age of 12 years old. Other than that, you would need to make a Voluntary Contribution to fill these gaps.
To enquire about making payments of Voluntary Contributions, please contact our National Insurance team.
National Insurance: general enquiries
Or you can use the webchat function ‘ask HMRC online’
You can also write in to:
PT Operations North East England,
HM Revenue and Customs,
BX9 1AN,
When submitting your correspondence, kindly provide your National Insurance Number, full name, current address, a contact telephone number, and a brief explanation of the purpose of your letter. Additionally, please remember to sign and date the document, even if it is printed.
Though you may not have been in receipt of Child Benefit payments you should check to see if you should have been in receipt of the credits. You can apply through the form CF411a, however if your children were over the age of 12 during this period you will not be eligible for credits.
Thank you.