They might not have to Andy, though I prefer they do and we get a coalition. That leads naturally to pr I think.
I pretty much know they won't have to, but also know that pretty much everyone who is against the Tories would more than happily take anyone else instead of the Tories. If seats are looking close/ at risk, then loads will vote tactically, and in other seats where there is less risk they will just vote whoever they like most. I fully expect one hell of a social media effort from the public, to help identify where seats are safe for Lab/LD or where it's going to need some tactics.
I don't see anything other than the Tories getting absolutely battered, in various different way's but it's 100% what I've expected as they've ***ed everyone off and their game of short term lies to paper over cracks was never going to be a solution to the massive void below, the only way it could have worked is if they weren't lieing, but it's all they've done. Had they told the actual truth they would still likely be in power at the next GE, albeit without brexit (which was their biggest lie of all, since BJ came in). At least Cameron and May where honest (ish) about brexit.
I just hope the Tory loss is so catastrophic that it leads to a complete overhaul, and puts to bed all these clowns we have in now, which I think it will do. I'd much rather Labour in power or a Labour/ Lib dem coalition, but also want the Tory opposition to be something like they were under all those pre BJ, as although those lot were bad, they're nothing like the current crop.
This bunch of tory clowns are going to be one hell of a mistake, but hopefully people learn from it. Hopefully some of those who voted for them/ brexit feel some guilt and take some responsibility for what they voted for and try to put it right by voting against them, rather than doubling down on a losing bet.