I think a lot of people are going to have a testing commute today.
A short while ago the M40 was closed in both directions between Junctions 4 & 6 following an accident. I think the motorway itself is now open, with some of the slip roads still closed. Visit the Traffic England website for more.
Meanwhile, the station car park and platforms are covered in a thin layer of snow that has frozen into a solid mass of ice. From what I can see of rural Buckinghamshire this morning (there's a faint glow in the sky), it will be picturesque this morning, but I'll be long gone before it is light enough to take a picture.