I am really wondering if we are not just overcomplicating this tragic crash a case of not seeing the wood for the trees?
Had this occurred into a Crane in a deserted part of Scotland on top of a mountain it would have seen some press and attention and put down as yet another CFIT accident operating low level in mist cloud and fog!
This has Grabbed all the attention because it happened in the Capital city and opened the publics concern at a helicopter coming down in a worse area where 10s or 100s could have been killed.
Regulations are a framework to work with they cannot stop a pilot getting into a mess.
Weather maybe one thing at a reporting aerodrome yet a completely different picture in isolated areas close by so regulations or weather it will always be up to the pilot not to get into dangerous or threatening situations where a small mistake can have awful consequences and this shows that even the best are not immune.