According to the latest data from YouGov, 18% of voters would be open to putting their 'X' in Mr Corbyn's party's box in 2029. The poll will make grim reading for the Prime Minister, made worse by the fact that YouGov found that 31% of 2024 Labour would think about backing Mr Corbyn, too.

That said, Britain's newest radical left-wing party still trails all five major parties in the YouGov data. The researchers found that 30% of voters would consider supporting Labour again at the next election, while 28% could be tempted to vote for Reform, the Lib Dems and the Greens, respectively.

Perhaps most startingly, only 24% of those surveyed said they would think about voting for the Tories.

When YouGov segmented those considering backing a future Corbyn-led outfit, they found that Green voters were the most likely to be open to a party led by the MP for Islington North at 58%.

A sizeable 21% of Lib Dem voters said they wouldn't rule out voting for Mr Corbyn's party, while a much smaller 2% of Tories and 3% of Reform supporters didn't discount the possibility either.

Given Mr Corbyn's new political vehicle is currently nameless, without policy proposals, and only has one well-known backer in Zarah Sultana, so many voters expressing support for it will cause concern in Number 10.