Someone at the Met Office just pressed the wrong button!! I just got an email alert for:
Amber Warning of Snow for London & South East England
Amber Warning of Snow for London & South East England : Bracknell Forest, Buckinghamshire, Greater London, Hampshire, Milton Keynes, Oxfordshire, Reading, Slough, Surrey, West Berkshire, Windsor and Maidenhead & Wokingham valid from 2100 Thu 05 May to 2200 Thu 05 May