How to request 10 year employment history that is not needed for a compensation claim

How do I contact HMRC for a 10 year past employment history that is not needed for a compensation claim? I know I can get the last 5 years through the HMRC app and these forms are here if I need my employment history for submitting a compensation claim- https://www.gov.uk/get-proof-employment-history and https://www.gov.uk/government/publications/national-insurance-employment-history-request- but I do not need the history for submitting a claim. It is for a volunteering role application that request a 10 year work history. Thanks

Hi SuzL28,
For the earlier tax years you will need to make a subject access request.
For details of how to do this please see guidance here:
Make a subject access request to HMRC
Thank you.