what kind of document do I need to prove that I pay in the UK National Health Insurance (NHS)

Hy...I'm romanian. I work in England since 2016 and before ( full time) but I'm still a romanian citizen and I go once or twice a year to Romania on my holiday. I have settled status and a UK contract in a UK company. I pay national insurance contributions in UK and I have a NHS number. So far, so good. I'm insured in UK and I can benefit from NHS services. Because I need health services as well in Romania and I'm still romanian citizen and I have my property rent in Romania, for these reasons, the Romanian authorities (NAFA: National Agency of Fiscal Administration) asked me to prove with a document that I pay from my salary for national health insurance in the UK (NHS in this case) including in 2024 year. I know that there is a mutual agreement between both countries ( UK and Romania). I pay taxes and contributions in UK and I should be covered in both countries. I have no clue where I can find that document. I understand this information can be filled in the E104 or SO41 form which is used between UK and EU countries...or other form..I don't know. Can someone help me, please! Thanks a lot. Claudia

Hi,
The foreign institution can request a S041 from the UK authorities on your behalf, this will depend on the UK’s withdrawal agreement from the European Union. They submit form SED S040.
If they are unable to request this and have advised you, then you can obtain your own record of national insurance via form CA3916.
Get a PDU1 certificate or a National Insurance contributions statement 
Thank you.