It’s important to keep ​a record of your past pension schemes to make sure you don’t miss out on benefits you’re entitled to when you retire.
  
If you think you may have lost track of a pension, the DWP website can help you trace the contact details for a workplace or personal pension (or someone else’s if you have their permission). 

However, the service can’t give you details about your pension or its value.
  
Visit gov.uk/find-pension-contact-details to start your search. You’ll need to know the name of your employer or the pension provider before you begin.
  
You can also request contact details from the Pension Tracing Service by calling 0345 6002 537 or write to:  
  
The Pension Service 9 
Mail Handling Site A 
Wolverhampton 
WV98 1LU