I've only just seen this post, some two months after it was flagged up to me.
We provide training (yes..) on how to break bad news, and the training is aimed at senior clinicians and those who should be tasked with the breaking of seriously bad news to patients and families, how to go about it, possible responses - etc. For this to have been left to a junior nurse seems wrong to me, IMO - but nevertheless, I feel for trolly in her loss. It would be interesting to know if she had any closure by now, with the hospital staff concerned...?
Nevertheless, to return to the question - I'm not aware of any formal Open Door policy in which patients have open access to any information - lots of NHS organisations have open door arrangements whereby people can more easily discuss concerns but I can't find a single formal policy reference on Google which says that this is a right.
If this happened as trolly describes (and I don't doubt it did) then it is likely to have been noted as a Serious Untoward Incident and will have been thoroughly investigated within a tight timeline, to see what may have been wrong in the processes and what can be learned from it. It doesn't help trolly, but it might stop anything similar happening to someone else in future. IMO.