I repeat it has nothing to do with politics, look at inflation and interest rates globally, treasury yields are spiking and the likes of Japan is in serious trouble. They are enacting yield curve control to protect the ¥ only for it to get smashed again and repeat the following week.
Yes the mini budget was idiotic, and the market sold off as the UK credit rating was looking shakey (trying to borrow and spend for tax cuts when should be going head long into austerity instead).
It really doesn’t matter what stamp duty/housing market props Sunak or anyone else tries to it in place. In 2008 was a bank led financial crisis, this time it’s a central bank/government treasury crisis which will be much worse. Most retiring on private pensions don’t even know yet their pension has already been decimated.