At the last general election alliances were formed reducing the ability for voters to cast a vote for their preferred party. In elections voters may not have a Political party with a manifesto they can vote for and their vote is wasted.
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Currently any marking on UK ballot papers that doesn’t constitute a vote in a box is classed as a ruined paper.
Sitting governments and opposition parties should have an awareness of how many people didn’t vote because they feel disenfranchised.
Introducing this option gives this proportion of the electorate a voice that must be acknowledged
Clearly some ballot papers would still be classed as spoiled and declaration of these should continue as previous.