Interesting (well, great for me) to see a notably cold Monday is on the cards.
GFS down here has been showing highs of 7C or 8C, whereas MetO's been varying between a high of just 5C to its current 8C. It looks like there's some cold upper air nearby, too, with the 12z GFS run showing a large pool of -5C 850s over much of England:
http://images.meteociel.fr/im/8812/96-7UK_hka6.GIF As expected, the depth of the cold pool is varying between model runs on both GFS and MetO (and the other suites too). This morning it was showing it to be cold enough for possible snow over the North and South Downs (as per the written MetO forecast this morning), although the mention of snow has gone from the afternoon update. FWIW, the forecast for Monday morning has gone from 3C with heavy rain to 6C with heavy rain on the latest update down here.
Even without the risk of snow it's going to feel pretty cold, especially compared to the unseasonable warmth last weekend!