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I imagine Individual Voter Registration (IER) would have been a factor in Cameron's 2015 majority. I don't think it's a bad thing in itself, but the practical effect was that 800,000 people dropped off the register between 2014 and Janury 2016:
Labour are concerned that the missing voters are primarily their supporters.
As we know, voter fraud is a very minor issue that is constantly being played up by the Tories in order to suppress voters.
This is what the Electoral Reform Society says about the way ahead:
https://www.electoral-reform.org.uk/campaigns/upgrading-our-democracy/voter-registration/
Cameron changed the method of getting young people, 16-18 year olds on the Electoral Register.
Previously each household received a letter requesting a list of residents at the property.
I think it was an offence not to complete the form.
Cameron cancelled this method, assuming that the more young people slipped of the Electoral Register the better for the Tories.
The obvious method to ensure teenagers are on the electoral register would be to require schools, colleges, universities register their students.