Thanks for your replies
@Jonathan Edwards and your ongoing work.
Just as a side point on sectioning and capacity for decision making (sorry, taking the thread further off-topic):
Practice varies, I don't think it is a big deal for some doctors. Having spent a lot of the last year sitting with an elderly relative in hospital observing what was going on around us, I have certainly seen doctors whose threshold for deciding that someone lacks capacity and needs to be sedated without their knowledge in order to impose care is surprisingly, and probably unethically, low. If doctors were uniformly acting in the best interests of their patients, were never stressed and tired, and always had plenty of time to explain things and didn't have to ration scarce resources, then the idea of sectioning would be less concerning.
But, regardless of whether a decision to classify a patient as lacking capacity is well-intentioned and appropriate or not, I have seen such a decision that was only in place briefly result in a patient losing trust in the medical system and decide that they will never seek hospital care again. Even if the patient understands that being sectioned is pragmatic, that it is simply a means to a desirable outcome, even then, as others have said, sectioning combined with a lack of a clear physical cause for the lack of capacity is likely to have ongoing negative consequences.
Categorising a patient as lacking in the capacity to make decisions for themselves is by no means rare. New Zealand's Law Foundation has done a lot of work on capacity and the following is from a 2014 report of theirs. I was astonished by the reported estimated prevalence of patients lacking capacity:
Although since 2014 views of capacity have become less binary (capable/not capable) and more situational.
Ha. Although we do know some things that make some decisions better than others.