Retrieve years worked in UK for pension in Spain

Dear team, I worked in UK between 2009 and 2013 and I need to export taxes to Spain for the pension. I do not know what´s the process and I cannot find the info. Could you please give me some guidance? Many thanks and regards Carolina

Hi,
As the information is over 5 years old, you will need to make a subject access request. You can see guidance here:
Apply to make a subject access request to HMRC
Thank you.