I don't know what it'll be like on the way down, but I'm in Southampton and the snow is pretty sparse in this neck of the woods. We haven't had any fresh stuff in days and all the main roads are completely clear now (just a little icy first thing in the morning). It seems to be it's own little micro-climate here, once you're a few miles out of the city it's just like everywhere else. The M3 and M27 will be fine though so once your in the south it'll only be the last few miles around Swanwick you're likely to have any trouble with.