They should be concentrating on voter turnout (e.g. online voting) and increasing those on the electoral register. The last changes to registration resulted in 800,000 being cut from the register, mainly the young.
https://www.theguardian.com/politics...s-figures-show
These changes will make turnout even lower. I suspect the motivation for this is nothing to do with security, but more trying to put more obstacles in the way for those less inclined to vote for a particular party.