I don't have anything to add on this sad accident itself (I agree that it is somewhat baffling at this stage - but I'm sure this very modern aircraft was equipped with all sorts of recorders that will yield useful input to the investigation) but, not living in the UK, I muss confess that I am surprised that this sort of operation would be allowed on what seems to be regular basis.
Is it really possible to get authorisation to land your helicopter pretty much wherever you want ? I would have thought that one would need to use designated helipads ?
I am not implying anything here - just curious about what the regulations are.