Can't believe I've missed this! I really should pay more attention.
I don't see that "new" evidence has come to light. The prosecution has said it isn't offering any evidence so, essentially, they are saying that whatever "evidence" they thought they had isn't evidence at all - or, at best, is so weak it doesn't meet the prosecution threshold.
Consider the number of times LL was arrested, interviewed and released under investigation, over an significantly extended period before she was first charged.
This leads me to consider whether the evidence may be heavily circumstantial, in that LL was the only staff member consistently present at the material times, together with a repeated course of conduct, particularly after earlier deaths, that could be used as a persuasive argument by the prosecution to show intent to cause GBH or death.
The actions undertaken in the 'attempted' offences have to be 'more than merely preparatory' to the substantive offence in question, i.e. Murder. E.g. loading a gun, pointing it and issuing threats would not be enough, whereas firing and missing or the gun jamming could be. Ultimately whether an act is 'more than merely preparatory' is one for a jury to decide.
Maybe in the matter of the dropped murder charge, LL is alleged to have undertaken a course of action similar to the other incidences but this did not cause the death of the child on that occasion. Although tragically the child died at a later stage, after further review the weight of the evidence to pursue a substantive charge of murder does no longer meets the CPS charging standard.
There is no doubt that this case is both exceptionally tragic and complex. The negative reviews of CoC Hosp by the RCPCH and NICE may well muddy the waters even further.
I can't think of a recent case where "beyond all reasonable doubt" will be so tangible when considering the evidence.