Solid commonsense approach to the problem it sounds like Rotorspeed.
Judgement, Training, Experience, and Currency are the keys....more words on paper alone is not the answer.
PHI lost an S-76 EMS machine a few Years back in very much the same manner as this 139 Accident and they were at an Airport when it happened (as I seem to recall).
Did not ORNGE in Canada lose a 76 as well to similar issues?
It is not just the UK or just the Corporate Sector where theses things happen.
Perhaps the UK Corporate helicopter folks need to take a hard look at how they do things but perhaps an over all review of the System itself needs looking at too.
Did not the UK Offshore Helicopter Industry not take a look at itself in the Recent Past and decide it needed to make some improvements?