"One Person One Vote" is a slogan that has had multiple uses over the years. It has been used to call for universal suffrage, for the abolition of plural voting and for equal sized constituencies (also called "One Vote One Value" in places). But the basic principle is the same throughout.
So it's interesting to note that at the same time that the Labour Party is running around screaming fake moral outrage about steps to reduce malapportionment in this country, they are also conducting a leadership election where One Member One Vote is noticeably absent. Instead some members will be getting significantly more votes than others. In theory a member could get no less than 32 different ballot papers and cast every single one of them without breaking the rules.
So much for Labour's claims for equality and democracy!
Hattip to Cllr Iain Lindley's Diary: Unequal Votes and Tory Radio: Do Labour MPs advocate stuffing the ballot box?.