Riding Air, I think you'll find the Met Office forecasts are verified by what has been physically observed across the whole of Europe. Take your crosshairs off the Met Office, and find someone else to blame.
I think you'll also find its not the Met Office telling planes not to fly, its NATS / CAA, and they're basing their advice on ICAO guidance, and guidance from aircraft and engine manufacturers.
and I think you'll find the "Not Fit for Purpose" thread actually turned out to be fairly pro-Met Office (once the misinformation / scepticism was taken care of)
There is an AWFUL lot of rubbish / misinformation flying around in the press and on here, from supposidly educated parties. You'd think they had their own agenda or something, and were looking for a scapegoat...