According to the Met Office, the regions and local authorities covered by the weather warning are as follows:

East of England: Central Bedfordshire, Essex, Hertfordshire, Luton, Southend-on-Sea, Suffolk, Thurrock

London & South East England: Bracknell Forest, Brighton and Hove, Buckinghamshire, East Sussex, Greater London, Hampshire, Isle of Wight, Kent, Medway, Oxfordshire, Portsmouth, Reading, Slough, Southampton, Surrey, West Berkshire, West Sussex, Windsor and Maidenhead, Wokingham

South West England: Bath and North East Somerset, Bournemouth, Christchurch and Poole, Bristol, Dorset, Gloucestershire, North Somerset, Somerset South, Gloucestershire, Swindon, Wiltshire