alliwantisagoodnightssleep the problem with voter ID that in practice it will mean photo ID which will mean a valid driving licence or passport.
The social groups least likely to have these documents are lower income ie less likely on the whole to vote Conservative.
It also makes it harder in general for people to vote eg if you forget to take it to the polling station or it has been lost/stolen just before an election.
There were multiple reports online yesterday about Conservative activists outside polling booths in marginals line Chingford and Woodford telling people that they needed ID to vote for example.
In essence, it discourages and puts barriers up to people voting in elections, which is generally considered to be quite undemocratic.