From the guardian link..quite sure this is where I was getting mixed up
Quote:
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You don’t need to pay the full fee if you only want to vote in the Labour leadership election, however – for a one-off minimum fee of £3 you can become a “registered supporter” and will get a ballot paper. Those who have signed up as Labour party supporters through an affiliated organisation or union will also be entitled to vote.
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Assumed only proper members could vote on that, so thought the membership fee was very low.