No, I didn't vote for Rishi Sunak (heaven forfend!), but then I've never voted for any PM, because we don't have a presidential system. In the UK you vote for an MP or his party. I can and do agree that two unelected PMs is a bit rich and that Sunak should have gone to the country to confirm his mandate.
Personally, I'd like to see PR in the lower house (maybe STV) with a majority elected upper house on a different system (party list) although with a percentage of direct appointees. Because the function of the upper house is to scrutinise legislation proposed by the lower chamber, I'd expect some very strict eligibility rules as to experience and suitability of candidates (so no mates of the ex-PM or party donors or people promoted so that they can be appointed elsewhere)
As to HS2, because we don't have a referendum system like, say, California that makes it a matter for Parliament under our system, and certainly as a matter of infrastructure and economic development so it should be. This is is regardless of my personal views on the subject of HS2
BTW in California the proposal system delivers some truly bizarre results at times.