By lunchtime, the temperature had risen to 5.5C, and the snow was melting off fast, with the tarmac being mostly clear and even in some places dry. A bit of fog which had drawn in then has now backed off again, and I can again see buildings that were invisible a while back.
So I don't expect any problems.
Well, none apart form the power cut we had while I was composing this post - too many heaters on an inadequate circuit does that.