It would be very interesting legally because I’m assuming it would be some kind of negligence case. However there are a few reasons I think this would fail unfortunately. One of the components that must be considered in a negligence claim is the standard of care given. The test for this is, without getting too boring, whether a responsible body of other doctors would have given the same care (with an extra ‘gloss’ on this test which is that it also has to withstand logical scrutiny). Unfortunately, the way this test has been interpreted means in general if there are some other doctors who agree with the care you gave, you satisfy the test. The ‘logical scrutiny’ was meant to prevent doctors from merely finding one other doctor and saying ‘look, here’s a responsible body of medical opinion who agrees with me’ but it’s rare that a judge will say medical treatment given does not withstand logical scrutiny.
The second reason is that I imagine gender clinics etc will be viewed differently than normal hospitals because unlike many conditions where you don’t know necessarily what treatment you might get, people take children to these clinics for HRT. They know that’s what it will be. And I think it would be very difficult therefore to prove negligence because, in essence, you have gone seeking that particular treatment which is quite different from most other conditions.
There is however an option I personally think could arise which is a class action if the advice the NHS as a whole gave was negligent. And by this I mean the fact that the NHS has recently changed their guidance to say puberty blockers are not reversible. But before that, they said they were. So if it turns out there was never any evidence for that claim, and the NHS was negligent in its advice previously, that would result in a potentially successful action against probably NICE or something rather than individual doctors.
Sorry if this was boring!