The current system of an electoral college allows multiple votes in different sections all having an unequal value, with a trade union levy payer vote having the least value and an MPs vote having the most value. (labour-uncut.co.uk)
The rules will apply to all 4 million existing political levy payers in unions affiliated to Labour, and those who are not. (theguardian.com)
In the union section of the electoral college, representing a third of the college, union political levy payers vote individually, on ballots requiring them to tick a box saying they support Labour. (theguardian.com)