Suspended for comparing Mossad to the Nazis, but Labour activist is pictured with Jeremy Corbyn

The JC understands Mr Watson is currently still suspended from the party.

A spokesman for the Jeremy for Labour campaign told the Politics Home website: “Jeremy visited phone banks across London yesterday and met hundreds of Labour members who are giving up their time to support his campaign to continue as Labour leader, so we can rebuild and transform Britain, so that no one and no community is left behind.

"Jeremy is regularly asked for his photo to be taken by members of the public who he has only met for the first time and politely obliges if he can.

“Everyone in Labour wants more people to join our party and grow our movement, but those who join are not allowed to be members of any other party and they must support the values of the Labour party.”

Mr Watson’s suspension came after he wrote on Facebook: “If I were a Palestinian, like most people... I'd probably want to be a guerilla fighter and liberate my people from a brutal and oppressive occupation.”

In another post, he called Zionism "a racist ideology".

Waltham Forest Momentum condemned Mr Watson’s suspension at the time, calling for it to be lifted after what it called “a lack of due process in this case, and the failure to apply the principles of natural justice".