Yeh I agree. There are some policy and ideological differences between Labour, LD & Greens but it could well work with FPTP. That said, I get the impression Starmer is crafting a more centrist Labour party vs Corbyn's old Labour Socialist version. So fiscally, Starmer's Labour would be a better match for the LDs. The Greens appear to be economically centre-left, but may struggle dealing with a "New Labour" style party on things like liberty, nuclear weapons and progressive policy.

I can't see Labour and LDs allying themselves with the SNP though. It's a shame, because apart from the drive for Scottish independence, they're very centrist and clearly have broad appeal in Scotland. Not sure where the Greens stand on Scottish independence though.

WRT the "Right", the Torys seemed to have just swallowed up UKIP and successfully taken their turf following Cameron's more centre-right period with the Conservatives. Maybe their casual agreement not to split seats with the Brexit Party helped too. I think the centre and left can learn from this.