Absolutely agreed. I think the ability of the person, their morals and their impact are important but long term consequences have to play a major role.

Trusses' impacts were immediate and large but have mostly receded. She wasn't around long enough to do any real damage and she's still out there garnering support from the same crazy fuckheads in the first place so no real changes there. They'll just put up someone else instead.

Johnson was by far the worst individual but the damage was relatively small because of how incompetent he was and in fact, he highlighted a lot of issues that will hopefully change for the better now. If another evil politician turns up and makes use of those but is actually competent, they'll go number one with Bojo number 2. Anybody would've struggled with covid and although he made it worse, I think other institutions lessened the impact somewhat.

Blair has the Iraq war, impact on Middle East and the start of the British fall in international relations, which probably puts him pretty high but I think some of the other stuff (e.g. making the BoE independent) probably does just enough to and him.

Brown was in power for too little of a time really but was instrumental in Blair's got so takes some of that heat.

A lot of the country would argue Thatcher should be up there. Her policies continue to have much support in the Tories and some parts of other parties. Definitely a contender.

Brexit has had the worst impacts on every part of our lives and will continue to do so for quite some time. It's also messed up NI, Ireland and the EU itself has suffered from it too. Cameron caused it and then jumped ship because he couldn't help or wasn't willing to, and either way is pretty bad. He has my vote for sure. No other single politic move has caused such a large negative impact.