You have the right to get a copy of the information that is held about you. This is known as a subject access request (SAR) and you can make a request to HMRC under the Data Protection Act.
Further information can be foundhere.
Comment
Not sure what you would find out about yourself but still worth knowing about.
"My team always attends the annual Payroll and HR Update course. Essential information covering often complex legislative changes, always presented by excellent trainers with in depth knowledge of their subject. A 'must attend' course for any serious payroll professional."
Deon Piovesan
Finance and Payroll Manager at Capital City College Group