Membership and supporter status within political parties in the United Kingdom typically contain restrictions including:
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Practically, involvement in a political party without membership may limit an individual's involvement. Parties that offer a lower level of affiliation, such as supporter status tend to have looser constraints.
History
Membership of political parties has been in decline in the UK since the 1950s, falling by over 65% from 1983 (4 per cent of the electorate) to 2005 (1.3 per cent). Typically party affiliation allows an individual to support only a single party. However a notable exception to this is the Co-operative Party who supports only Labour and the SDLP and since 2016, More United which supports liberal and progressive candidates.
Current membership
Some political parties in the UK disclose their membership, some do not, there is no legal or electoral obligation to give figures let alone accurate figures.
Enforcement
There are few high-profile cases of membership criteria enforcement and as such tend to happen under exceptional circumstances.
2015 Labour Leadership Election
During the 2015 Labour party leadership election it emerged that 260 former candidates from the Green Party, Left Unity and the Trade Union and Socialist Coalition had attempted to become registered supporters but will now be blocked from voting. Shortly before this it was revealed that Conservative MP and former junior minister Tim Loughton had been caught applying to become a registered Labour supporter, subsequently claiming that his intention was to "blow the gaff on what a complete farce the whole thing is". Veteran Labour MP Barry Sheerman also joined calls for the election to be "paused" over the fears of infiltration by other parties. The Labour Party told representatives of the four candidates at a meeting on 11 August that 1,200 members and supporters of other parties had been excluded and a further 800 were under investigation. Harriet Harman at the time admitted that as many as 100,000 people may be blocked from voting.
The number of those rejected would eventually reach 56,000, around 9.1% of the 610,753 considered eligible to vote at the start of the contest. According to the party, 45,000 of those were rejected for not being on the electoral register.
Labour also confirmed that it would cancel supporters' votes after they had been cast if it was found that they were members of other parties. A number of high-profile individuals have been blocked from voting, including Marcus Chown, Jeremy Hardy, Douglas Henshall, Ken Loach, Francesca Martinez, Mark Serwotka, Pete Sinclair, Mark Steel, Luke Wright and Toby Young.
Andrew MacKinlay, a former Labour MP, further alleged that Labour was attempting to rig its own leadership election against Corbyn; a view shared by Jeremy Hardy. Such allegations became known to the media – and particularly Corbyn supporters – as the "Labour Purge", with #LabourPurge trending on Twitter. Claims of such a "purge" of Corbyn supporters were rejected by Harman who insisted that the exclusion processes were impartial to candidates. Scottish newspaper The National printed a page-long satirical cartoon speculating further vote-rigging by Labour's leadership.