SFFP, Thanks, I knew the limits were something like that but couldn't remember for certain.
Boslandew, In RAFG the RAFSH day visibility limits were even lower, I'm certain it was 500 metres; I certainly recall many times sitting at Gutersloh in "Red" (airfield closed due wx) conditions waiting for the station met office to declare the next level, (Amber) weather and off we'd all go, all over the place. We also had a very limited icing clearance (+4 degrees in cloud) in the Puma in those days when the aircraft still had open and unprotected engine intakes.
Those who try to say this Chinook crew had no business flying in poor weather have really no idea how the SH Force had to routinely operate.