Around 4% of registered voters – more than 1.9m people – do not yet have a suitable photo ID that will allow them to vote in the general election.
The research from Royal Holloway, University of London and Survation found that the proportion of registered voters lacking suitable ID is far higher in some areas.
In Wakefield West in West Yorkshire and Liskeard Central in Cornwall, for example, it rises to 39%.
Commenting on the research, Professor Chris Hanretty said: ‘The vast majority of registered voters have photo ID, but a small proportion don't, and that small proportion gets bigger in some areas. If just a few of these voters without ID turn up to vote, we can expect lots of stories about people being disenfranchised.’
Check out: What is voter ID? and Implementing the new voter ID requirement.