I know an anti-Tory pact won’t work

I appeared on Radio 4 with Shirley Williams recently and as we were leaving I asked her if she thought Labour might split if Jeremy Corbyn were re-elected. Would the history of the SDP, which she helped set up in 1981, put off Labour moderates from trying something similar?

She thought it might, but suggested an alternative, which was a ‘non-aggression pact’ between all the left-of-centre parties. ‘We can unite around the issues we agree on and get the Tories out,’ she said. I didn’t have time to explore this in detail, but I think she meant some kind of tactical voting alliance whereby supporters of Labour, the Lib Dems, the Greens — possibly even the Welsh and Scottish Nationalists — would agree to vote for the left-of-centre candidate in their constituency who had the best hope of defeating the Tory candidate at the next election.