As for your dismisal of covering surfaces during ZR
Clunck...not dismissing it....just saying it wouldn't work at YYZ 1 because of the amount of pavement involved and 2 because you can't release the runways and taxiways for the amount of time you are talking about to complete said operation. I reiterate that snow and ice removal at YYZ was not the issue that caused the ground stop last week.
Enjoy the mother land. One flake of snow at Heathrow, as you well know and you will be absolutely gushing about the GTAA. Hope the locals treat you OK.