I drove from Brighton to Bracknell yesterday and with the exception of one set of lights on a hill that I got caught at it was pretty much without incident. I had to do a hill start in 3rd, in my 1.6i astra whilst wearing snow boots. Not ideal.
The M23, M25 and M3 were all fairly clear although the outside lane was out of use on all but the M3.
There is a lot of slush around though !