Torrential thunderstorms near Thetford today. Started again as I left work at 4.30 and have to admit that driving through Thetford Forest on the B1106 was the worst weather I have ever driven in! Heavy sheet rain falling through the trees so the wipers were on super fast and still not coping. Doing no more than 30mph on a 60mph road you were able to see the white dotted line down the centre. Unfortunately, even though the lines were quite clearly visible they were under at least 4" of water. In a few places the water was up to the sill on my Peugeot Partner but, thankfully, with it being a relatively high car I was able to get through. Sadly a fiesta and a corsa, in two different places, never managed it going in the opposite direction. Both drivers standing under trees in the pouring rain on their phones. No doubt to a garage or towing company. I do not want to experience that again, and I consider that I have driven in a number of difficult weather conditions over the years.