Yellow Warning of Fog for London & South East England :
Oxfordshire, Buckinghamshire & Milton Keynes
Yellow Warning of Fog for East of England :
Central Bedfordshire, Hertfordshire, Bedford, Cambridgeshire, Essex, Luton, Suffolk, Norfolk & Peterborough
Valid from: 2100 on Wed 14 Nov 2012
Valid to: 1100 on Thu 15 Nov 2012
Fog is expected to become widespread and dense later on Wednesday evening and overnight into Thursday across southeastern parts of Wales, the Midlands and possibly East Anglia.
Issued at: 1539 on Wed 14 Nov 2012
http://www.metoffice.gov.uk/public/weather/warnings/?regionName=se&from=rss&sn=813FF218-E6AD-364C-8031-FF853E7D80B5_1_SE