some more confirmation of that freakish -17 recorded in Benson , South Oxfordshire last night http://www.telegraph.co.uk/topics/weather/6947178/Snow-to-stay-as-temperatures-plunge-to-coldest-this-winter.html "Lows of minus 17.7C (0.14F) in Benson, Oxfordshire, and Woodford, Greater Manchester, eclipsed minimum temperatures at many of Europe's famous ski resorts. " thats one incredible "frost hollow" , as some of the other posters mentioned about that place.