and perhaps it could be argued that if the commander is unable to receive some sort of control service (radar, procedural in CAS) whilst flying in cloud then "all possible measures" includes taking another route, altitude/Flight Level or even not embarking on the flight!
Surely that's much more appropriate to a "fine" summer's day than flying in cloud? The probablility of collision is dominated by traffic density: the risk is much higher on a VMC day with high traffic density than in cloud with much lower traffic density -- in fact I'm aware of no collisions in cloud in the UK at all.