Footage from across the south shows how the storm took hold, as Jeremy Cooke reports
Four people have died after a storm battered southern Britain, leading to 600,000 homes losing power, and rail and flight cancellations.
A teenager in Kent and a man in Watford were killed by falling trees.
A man and a woman died in west London after a falling tree caused a suspected gas explosion and house collapse.
Train companies are running reduced services but say they hope to run full services on Tuesday.
BBC forecasters say the storm, which saw heavy rain fall across many areas and wind speeds of more than 70mph, left the UK shortly after 12:00 GMT - leaving a "broadly windy day".
The strongest gust of 99mph (159km/h) was recorded at Needles Old Battery, Isle of Wight, at 05:00 GMT.
Travel warnings include:
- South West Trains is running a severely reduced service
- There is a limited number of East Coast trains running south of Peterborough
- Virgin West Coast is starting to run limited services out of Euston
- First Capital Connect has started to resume services but says the London to Luton will be closed all day
- C2C said Some train services have resumed but major disruption remains
- A reduced service is running on Greater Anglia but Stansted Express services remain suspended.
- Southern and Gatwick Express said the Brighton mainline has now been cleared of trees and services are running on temporary timetable
- Southeastern is operating a limited service on all routes, except for the Deal and Dover, Bat and Ball and Sevenoaks, Eynsford and Shoreham, and Otford and Maidstone East lines
- First Great Western is running services on most routes, but with delays and alterations
- Chiltern Railways is running a normal service but says there may be some delays and short notice cancellations
- London Overground says there is no service between Camden Road and Richmond/Clapham Junction
- Transport for London said the Piccadilly line west of Acton Town is the only Tube service now running with severe delays due to earlier debris on the tracks
- Airports including Heathrow and Gatwick saw flight cancellations in the morning and are advising passengers to check with their airlines
- The Port of Dover was shut at about 07:15 GMT but reopened at 09:10 and P&O said there may be delays to services
- The Severn crossings re-opened, but flooding is still affecting roads in Wales
- The Highways Agency is advising motorists to check the weather forecast and road conditions before they travel
Bethany Freeman, 17, suffered fatal injuries when the tree came down on the caravan where she was sleeping in Hever, near Edenbridge, at about 07:20 GMT.
The caravan was next to the house she lived in with her family and she had been sleeping there while renovations were carried out.
Donal Drohan, 51, from Harrow, was pronounced dead at the scene after a tree crushed a red Peugeot 307 at Lower High Street in Watford, Hertfordshire, at 6:50 GMT.
Mark Joseph, who was passing by before the emergency services arrived, said: "We tried to assist, trying to get the tree off, but it was impossible... The poor chap didn't stand a chance."
The man and women who died in west London were found after three houses collapsed and two others were damaged following a gas explosion after a tree fell during high winds in Hounslow, the London Fire Brigade said. Three people injured in the incident were taken to hospital.
Power restoredThe Energy Networks Association, which represents power companies across the UK, confirmed 166,000 homes were still without power by 17:00 GMT.
A spokesman said 407,000 households which lost power earlier had been reconnected, but more had been cut off as the storm moved north and eastwards.
Network Rail said the damage to railway lines had been "worse than expected", with more than 100 trees on the lines.
Several hundred staff have been working to monitor conditions and react to damage.
Anthony Smith, chief executive of rail customer watchdog Passenger Focus, said it was "too early to tell if the industry made the right call when cancelling so many services, but the fact that major incidents have been avoided is good news".
The Environment Agency had dozens of flood warnings in place - in areas of south-west England, East Anglia and the Midlands where flooding was expected, but the number is now down to four. There are also more than 100 flood alerts, where flooding is possible, across England and Wales.
It says there is an increased risk of flooding from rivers following the heavy rainfall, and large waves and strong winds may continue to cause some minor coastal flooding along the south coast.
Prime Minister David Cameron said the deaths caused by the storm were "hugely regrettable".
Asked whether train companies had over-reacted, he said: "These are difficult things to handle because you don't know for certain just how strong the storm will be."
In other developments:
- The search for the 14-year-old boy - who has been named as Dylan Alkins - who was swept away in Newhaven, East Sussex on Sunday has resumed
- A double-decker bus "rolled over" in Suffolk, injuring the driver and several passengers. Witnesses told police the vehicle blew over at 08:00 GMT, rolling onto its side and coming to a stop in a field in Hadleigh
- Both reactors in Dungeness power station's B units have been automatically shut down after power to the site was cut off. The site's own generators are providing power to the site
- The Metropolitan Police says it received 792 calls to its 101 and 999 numbers between 06:00 and 08:00 GMT, compared with the 200 it would normally expect. The most common call was for "tree in road"
- Sussex Police say 125 trees have fallen across Sussex - including one on a taxi in Eastbourne, from which the driver climbed out uninjured
- The helter-skelter at Clacton Pier in Essex has blown down, but the structure has not fallen into the sea
- London Mayor Boris Johnson has chaired an emergency resilience meeting involving all emergency services and relevant agencies - and later made a statement thanking them for their hard work "dealing with one of the fiercest storms of the last few years"
- Deputy Prime Minister Nick Clegg has cancelled his monthly press conference because of a crane collapsed on the roof of the Cabinet Office
BBC weather forecasters said in more populous areas including Lyneham, near Swindon; Yeovilton in Somerset and Hurn, near Bournemouth, speeds of 74-75mph (119-121km/h) had been recorded.
It has released figures showing the strongest winds and heaviest rainfall during the storm - with Otterbourne in Hampshire receiving 50mm of rain.
Wind speeds of 115 mph were recorded during the so-called Great Storm of October 1987.
Continue reading the main storyThere is more information about the forecasts for Monday on the BBC Weather, Met Office and Environment Agency websites. See BBC Travel News for up to date travel information and the Highways Agency and Traffic Wales websites for details about road conditions. BBC Local has information from your area.
Send your pictures and videos to yourpics@bbc.co.uk or text them to 61124 (UK) or +44 7624 800 100 (International). If you have a large file you can upload here.
Have you been affected by the storm? Has the weather altered your plans or disrupted your travel? Please send us your comments using the form below.