VMC Limits
Thank you for your replies
However, the matter still remains unclear. Olive Oil quotes, with a reference, Helicopters below 140 knots, Clear of cloud, in sight of surface, (the other option, 1500 metres clear of cloud, 1000ft vertically and 5nm vis surely refers to flight above cloud and is not really relevant here)
Flipster, with a reference, quotes the same but with a requirement for 1nm visibility.
After posting my query, I had a brainstorm and found the MOD response to the Mull of Kintyre Groups report. (I'm not being a smartass, I had genuinely forgotten this source, happens when 65 kicks in.) There it states, a prescribed minima of 1 nm vis beneath a cloud base of 250', no reference given. Since the verdict must have been based upon this definition, how come no-one else seems to be aware of it?
There is a suggestion that SF crews may have had lower limits, presumably classified so I won't pursue it.
How can something so elementary as VMC have three different definitions?