the reason it's taking so long to clear is that they only have one plough and it is done by fire setction. They then have to plough all the runways and taxyways. The runway was closed yesterday morning up untill 11:30am.
Since it's the scottish rugby airlifts this weekend, extra flights are handled and the departure lounge is full. Causing BMI Baby to cancel all flights out of CWL except for the 10am flights which are only now boarding and the EDI tonight which will be extremely delayed.
I think they don't start clearing the runway and taxyways until the snow stops.