The founder and head of Momentum, the hard-Left activist group accused of bullying and intimidation by moderate Labour MPs, has been working out of Jeremy Corbyn’s office.

Jon Lansman was seen four times last month using a desk in the Labour leader’s set of rooms in Parliament according to multiple sources.

The news undermines previous claims that Momentum is run independently from Mr Corbyn’s office after a series of fierce rows about the group’s behaviour towards MPs.