Big fat tyres + only 800kg in weight = no traction.
Couldn't even get the Roadie out of the drive this morning on the snow! Fortunately, Mrs Dynamoo's rather heavier Rover 25 did.
Still, it's funny seeing all those people who've spend a fortune on BMW X5s and X3s to discover that they've got all the offroad capabilities of a milk float in this weather. :)