My ride in was slow - a lot of roads were clear of slush but some were slushy and some icy. I just about stayed upright for the duration, though. It was interesting pulling the child trailer down the paths made by cars in the snow - I could tell when one of the wheels was hitting the snow from the drag.
I had only one really hairy moment - (having now left the trailer at home) - I was going at a fair pelt around Russell Square as it seemed entirely free of ice and slush. However, when it got to the point where I exit along a cycle path, the path was with nothing except large quantities of knobbly crunchy ice and for some reason I didn't slow down nearly enough. It hit it at speed and barely stayed on, bouncing all over the place: "A-A-A-A-a-a-a-h-h-h-h-h-h-h-h-h!" I didn't dare hit the brakes but eventually slowed to controllable speed. Phew!
I do wish though that I had bought some of those studded ice tyres. They'd be fun.