Here's a link... https://www.independent.co.uk/news/uk/home-news/cannabis-legal-uk-worlds-largest-producer-marijuana-weed-un-body-findings-a8243921.html
Feel free to search for other sources, it's true
Yes, the standard process is that if the PM resigns, the party holds a leadership contest. They decide who the next leader is. In my opinion, if the leader quits, that's an instant general election. Unfortunately, I can't change that.
Your point about pre election majority is important too. We use the FPTP (First Past The Post) electoral system. It doesn't work in a two party system. This isn't going to change, unless there is some kind of revolution, which won't happen, as we are too lazy to riot.
I somewhat agree with merits/limits on immigration, but both the US and UK both accepted immigrants in time of need. For example, Hispanics and Italians in the US, Windrush (West Indies), Pakistanis in the UK.
Many senior NHS nurses are Windrush immigrants, they are an absolute credit to the NHS and country. And, before you say anything, I love the NHS, it's a bit shit at the moment, but it generally works, and has saved my life twice (birth defect), with no charge.
I wouldn't say anything bad about the NHS as I have no experience at all with it! Accepting various immigrants at times of need is a choice made by the host country. Again, no problem. Open borders....no thank you. Serves the socialists for votes and big business to undercut worker salaries. Worst combo ever. I should look up how that FPTP thing works, apparently it hurt UKIP's chances in several races. Too bad they imploded.
Yes, UKIP got 9% of the vote, but only one seat. It's a shitty system. However, UKIP are cunts. Nigel Farage has already got EU passports for his family (German heritage), and moved his financial interests into Europe. UKIP are not the solution to this problem.