Driving Licence Change Today: You No Longer Need the Paper Counterpart. Probably.
From today, the paper counterpart to the photocard driving licence will not be valid and will no longer be issued by DVLA. The counterpart was introduced to display driving licence details that could not be included on the photocard. These details include some vehicle categories you are entitled to drive and any endorsement/penalty points.
You can read more at https://www.gov.uk/government/news/driving-licence-changes
However, there some instances where it may be useful, especially hiring a car abroad. You may also need to make other arrangements hiring a car in this conutry. See http://www.independent.co.uk/life-style/motoring/motoring-news/driving-licence-paper-counterpart-changes-how-to-hire-a-car-on-holiday-10304046.html for more details.