From the 8th June 2015 there has been a change announced by the DVLA with regards the UK driving licence. Until now the standard format of the licence has been a photo card licence alongside a paper counterpart licence. The paper counterpart was more detailed and had information on regarding to penalties that you had received on your licence that previously could not appear on the photo card. All penalties are now only recorded and stored electronically therefore the paper counterpart of the licence has become obsolete.
The DVLA will no longer be issuing the paper counterpart licence and have instructed people with a current one to destroy it in a secure manner.
If you still have the old-style fully paper licence then do not destroy this, it is still valid and will only be upgraded to a photo card by the DVLA if you need to change any of the details on it.