That was always the Met Office forecast. Warm front meets cold mass and transient snow for short few hours before very mild Sunday for large areas of southern UK.
It then gets spun by some of the useless press like the Express, Mail, Reach local titles like Essex live etc as severe all day snow in London and South/Midlands when it was always mostly a north of England/Scotland affair. Happens so often. Also, apps on phones are hopeless for forecasts especially severe weather.
Whenever there's severe weather possible I go to the Met Office and Netweather websites. The rest are invariably clickbait.
There's potential snow in Weds too in the south. Not nailed on. Met Office and Netweather state it's merely a chance and scope not known. Daily Express, Daily Mail, ITV morning TV, weather apps etc? Going nuts as ever about blizzards. Nothing is yet confirmed.