If you're at a flagship hospital then I think you're alright.
I like London Bridge Hospital - they have been amazing for me every time I have been there for procedures. If anything ever went seriosusly wrong then Guy's is across the road.
Like I say, I overthink everything
On the other hand, plenty of people are dying in A&E anyway now so it's a lottery.
I really don't want to dig into the clinical negligence cases I have seen within my own social circle. The NHS has literally gotten away with murder through negligence in my own experience and probably still does every day.