In an Electoral Commission report in January 2014, one of the recommendations was to introduce identity checks at polling stations. 

"Polling station voting in Great Britain remains vulnerable to personation fraud because there are currently few checks available to prevent someone claiming to be an elector and voting in their name. This part of the system could become more vulnerable to fraud as other processes (including electoral registration and postal or proxy voting) become more secure. We have therefore concluded that there should be a requirement for electors across Great Britain to present an acceptable form of identification prior to voting at the polling station.