Peak wind gusts now mostly in the range 30-40 mph in eastern England indicating the worst is now over for southern UK.
David Cameron said the loss of life as a result of the storm battering Britain is "hugely regrettable".
The Prime Minister said the Government is working to make sure that the emergency services are able to do as much as possible to provide assistance.
On a visit to the Mini plant in Oxford, he said: "Any injury or loss of life is hugely regrettable. We have to make sure the emergency services can act as fast as they can to help people."
A man has died after a tree fell onto his car in Watford, Hertfordshire, police said.
A tree fell at 6.50am this morning on Lower High Street killing the man, who was in his early 50s, a police spokeswoman told ITV News.
London Fire Brigade reports that an elderly woman is in hospital after a gas explosion caused three buildings to collapse and damaged a further two in Hounslow, south-west London.
– london fire brigade
Three houses have collapsed and two others have been damaged following a gas explosion on Bath Road in Hounslow. Three people escaped from the properties before firefighters arrived and an elderly woman has been taken to hospital by London Ambulance.
Urban search and rescue crews are working to make the structure safe and ensure any fires are put out. Twelve people were evacuated from surrounding properties as a precaution. Crews have rescued a dog from one of the houses.
Six fire engines are at the scene with a number of specialist vehicles.
London Fire Brigade has six engines and more than 30 firefighters at the scene of a gas explosion in Hounslow, south-west London.
6 fire engines & over 30 firefighters dealing with the gas explosion caused by fallen tree on Bath Road,Hounslow. Please credit LFB on photo
South West Trains has reported several trees on the lines, including this one near Fareham in Hampshire which knocked over a signal point.
This tree, at an unknown location, is holding up part of the bank and will take "additional time to clear," the train operator said.
The line between Farnham and Alton, both in Hampshire, has been blocked by another tree
A tree collapsed causing a gas main to rupture and cause a possible gas explosion in Hounslow, London Fire Brigade said.
A 17-year-old girl died after a tree fell onto the home she was sleeping in at Hever, Kent Police said.
ITV News readers have been sending in their pictures of the storm damage including many uprooted trees.
Please send your pictures to YourStory@itn.co.uk