We travelled down from Norwich to Swanley earlier, i had no idea we would be hitting heavy snow on the way. At first it just reduced visibility but then it started to settle and traffic was down to about 20mph in places. We witnessed one crash where a car had spun and hit the barrier. We had a heads up, that the Asda car park in Swanley has cars stuck in there for hours, and the main London Road was gridlocked. We approached through some minor roads, generally ok to pass, but then we came to Hextable and saw the slush that had frozen to thick ice about an inch in places. Twice i nearly hit the kerb as the van slide sideways and i was only going about 2 mph! I have never seen roads freeze like that, i've only been driving 11 years but i have driven in snow and ice before, this was something else. My guess is that the ground is still below freezing, despite a thaw taking place this is then freezing again on the ground. The rain then snow on top of the ice has created a lethal combination, i would urge anyway who is thinking of going out in this area to NOT bother. My main concern is of reports there will be more snow for the south east/London overnight. Is this true? If the temperatures stay below freezing i may just stay at home.