AV+ was not a PR method and only offered minor benefits above FPTP. It would still lead to a concentration of power between the two main parties, but it would increase the overall number of seats gained by a centrist party.

AV+ suited the Tories (and Labour) only slightly less well than FPTP, but Lib Dems would have been a much bigger spare leg if it had gone through. For the Tories, it was a win-win result.

In other words, the LDs allowed themselves to make another compromise, being tempted with another minor power grab, and in doing so allowed themselves to be outplayed again, and didn’t even gain us the minor democratic benefits AV+ had to offer.

As for AV+ being a short leap to PR, I have doubts, even though I voted in favour of it. PR would be less beneficial than AV+ to the three main parties now, so why would the LDs try to push it through? Also the referendum would have been used as a weapon - “the people voted so we can’t change it” - just as has been done for election reform, the Scottish Referendum and Brexit since.