Employment history search process

Hello, I need to obtain a list of my employers whilst I was working in the UK (as a UK citizen) from 1985-2001 to the French authorities in order to get my French pension. I obtained my PDU1 which states clearly the qualifying years but does not list the actual employers. I was a electrician working as a contractor for 5 years of this period so was moving around lots of jobs and employers so I have vague memory of the details. I am about to fill in a UK HMRC 'Request your employment history' form and send this in but they are asking for many of these employment details which I am not 100% certain of. My question please is how detailed do I have to be with this HMRC form and is this indeed the correct form I need to fill out? Also, does HMRC keep a record of all of these employers considering they have accurately NIC years in the PDU1 form? Many thanks Michael

Hi,
You may need to make a subject access request (SAR) for the information you require. You can see more information here:
Apply to make a subject access request to HMRC
Thank you.