Voter registration changes for new electoral register
1 September 2014 Last updated at 16:02 BST
Those wanting to vote in local or general elections have to be on the electoral register.
The way that register is being compiled is changing with a new system to cut fraud - but there are concerns it will leave some without a vote.
In a Daily Politics film, reporter Giles Dilnot spoke to David Cowling from BBC Political Analysis and Research, Green MP Caroline Lucas, and Andrew Scallan from the Electoral Commission.