Until recently in the U.K. you registered to vote on a household basis. There was an enumeration, and someone in the house could actually indicate that there were persons present who were eligible to vote and so on. Now they are going to individual registration. They are making changes, as you indicate, to the requirements to produce identification, but they are also allowing for online authentication of voter identity. They are trying to make it easier both to register and to actually cast a ballot on election day or in advance polls.
From talking with Mr. Peter Wardle, who is the executive director of the national electoral commission, I understand they haven't had serious problems in terms of even a significant amount of voter misrepresentation. It just doesn't happen, quite frankly, in this system.