Yes of course miscarriages of justice happen for all those reasons. No one suggested otherwise . But we are discussing the details of this particular case.
The concern with this case is the scientific evidence that was presented in court was deeply flawed.
No doubt in this case no. 3 on your list was also a factor (given the media reporting) , but perhaps this could have been overcome if the scientific evidence had been properly challenged in court. It certainly couldn’t be overcome without it.
We have no reason to suspect no 2. on your list was at play here.
As for 1. - This is not a case of the science was “incontrovertible at the time” and since then it has been debunked. What is known about the medical and statistical evidence the now , was known then, it just wasn’t presented at trial.
Why?
Perhaps no defence witnesses wanted to come forward . Why? I don’t find “disinterest” (your no 4.) very likely, since the trial was huge at the time. Fear of reputation seems much more likely to me and in keeping with what doctors and nurses have shared in the press since the trial.
No 5) as you say makes little sense in this case.
No 7) I am not a legal expert but have not heard anyone make a case for this.
So here we are with no 6)… what we do know is that LL had no expert witness to testify in her defence except a plumber. This is an objective fact. The result of this is that the jury only heard the prosecution witness’s interpretation of the medical evidence , (and erroneous statistical inferences were used by the prosecution unchallenged). We also know that many credible expert witnesses have come out since and poked any number of holes in this evidence as it was presented to the jury.
so not fantastical or misguided at all to be asking questions around 6) when you consider the context and particulars of this case.
I have to say you come across as speaking from a position of some arrogance (which you seem to think is justified because you are a criminal barrister), yet I do wonder if you have much knowledge of the details of this particular case and why people are questioning the integrity of the conviction?