New figures show 4,795 people left the Labour Party last week – one of the biggest weekly falls since Jeremy Corbyn became leader.
But 819 people joined last week meaning there are now 552,175 Party members – still a huge increase since Corbyn was elected leader in September 2015.
The majority of leavers are lapsed members who have not renewed their membership after joining in the wake of the EU referendum in 18 months ago, according to Party insiders.
A total of 30,394 members are behind with their payments – around 5 per cent of the membership. The new figures also show that nearly a quarter of members – 112,308 – are in Greater London.
Although the large fall can be explained by a spike in applications 18 months ago, the fact it has been attributed to Remainers who haven’t renewed their membership illustrates that Labour’s opposition to hard Brexit was a major factor in attracting new recruits.