One of my brothers was sectioned 3 years ago in The Bethlem for 2 months following a suicide attempt.
I attended all of his psyche evaluations. I can tell you that that place was ****ing scary. People screaming and shouting, coming up to me asking for money, my phone, food, cigarettes, etc. (mostly in a pretty threatening manner). It was all too apparent why the word 'bedlam' came into being.
Nobody who doesn't have to be in there would want to go within a mile of it. My brother was no risk to anyone else, but was certainly at risk from other occupants. There was a 3 or 4 day wait in hospital while a space was found for him. It's 1out, 1 in, because these places are overrun, as are the prisons and hospitals.
In her police days, my wife committed 6 officers per day to provide round the clock observation of a minor in hospital, who was a significant threat to herself... because there was nowhere for her to go for 2 weeks. That's 84 working days and a desperately needed bed in a single room...and this is repeated all over the country.
It's a ****ing mess.
The whole system is in crisis. The only surprise is that this type of incident doesn't happen more often.