In many northern seats the presence of a Brexit Party candidate is not going to hinder the Tories, it's going to help them. Most of those intending to vote Brexit Party are not traditional Tory voters, they are traditional Labour voters and Len knows this. Hence his desperate plea. Nigel Farage is also well aware of this situation and has quite rightly pointed out that the Labour 'surge' of 2017 was helped in no small way by the collapse in the UKIP vote. Hundreds of thousands of pre-referendum UKIP voters switched back to their traditional Labour vote post-referendum. As we have not left the EU there will be plenty of Labour Leave voters considering a vote for the Brexit Party and thereby tipping the balance in some northern marginals.
We must continue to remind people of the false choice of Labour's second referendum. Sorry Len, but when you're offering Remain vs Remain the workers are left with no illusion that you're a Remain party.