Updates for London have now ended but we'll be back on Monday at 08:00 with the latest news, sport, travel and weather.
- Updates on Friday 20 May 2016
It will be a cloudy night, with outbreaks of rain which will be heavy at times.
Tonight will be mild, with a south-westerly breeze.
Lows of 11C (52F)
Private hire firm Addison Lee has revealed it is in talks to test driverless cars as part of a £12m technology investment plan.
Chief executive Andy Boland said the London-based company is working with a car manufacturer on plans to test the vehicles as it steps up to the challenge posed by digital rival Uber.
"We are talking to a manufacturer about testing driverless cars, but it's early days.
"There's a big debate about insurance and how it would all work, but technology is going in that direction and we are dipping our toe in the water."
BBC London News
On tonight's programme:
We'll have the latest from Hampton where four women were stabbed earlier - one critically. A man in his 60s has been arrested.
Also on the programme, find out about the transatlantic plan to fight cyber attacks and why London has welcomed more than 30m visitors for the first time.
Plus, we look ahead to Crystal Palace taking on Manchester United in the FA Cup Final tomorrow at Wembley.
BBC London reporter
Visitors to London increased by 20% say the Office of National Statistics, with 31.5m tourists last year.
Top spenders in London are Americans, French, Italians, Spanish and Germans according to Visit London.
Camden New Journal
Planners could barely contain their fury as luxury home developers left the Town Hall with a deal to make a cash payment in return for ditching affordable housing units previously agreed for a prime site in Covent Garden.
BBC London Travel
BBC Radio London Travel
Here is the latest travel news for London:
On the roads:
Staines: The A30 westbound is closed due to an accident involving seven vehicles. There is queuing traffic between M25 J13 / A30 Staines By-pass / B376 and M25 J13 / A30 Egham By-pass / A308 (Runnymede Roundabout)
Hornsey and Wood Green: There are long delays due to an earlier accident involving a lorry on A504 Turnpike Lane. Queues are in both directions between A105 Green Lanes / A1080 Westbury Avenue / Langham Road (Turnpike Lane Station)
Wembley: Blackbird Hill in both directions between A4140 Salmon Street and A406 North Circular Road (Neasden Interchange) has congestion on Neasden Lane to A407. All lanes have been re-opened however there are residual queues around Wembley, Stonebridge and Willesden
A13 Rainham: Eastbound entry slip road blocked due to an accident involving an overturned lorry and a tanker at Ferry Lane (Ferry Lane Interchange). The accident is on the north Ferry Lane roundabout.
On the trains:
At Victoria, there is a reduced service on Southern between Victoria and Brighton, due to a shortage of staff because of sickness.
Keep up-to-date with BBC Travel.
Ten new Gentoo penguins have moved to London to live at the Sea Life Aquarium.
The penguins that had been living there were taken to Edinburgh Zoo while their enclosure was refurbished.
But many of them fell in love with their new Scottish roomates and zoo keepers didn't want to separate them - so 10 different penguins have come to the capital instead.
Jamie Oliver was joined by Cheryl earlier at his Cookery School in Westfield Shopping Centre, to launch a Facebook "live" event.
The event featured chefs from 10 countries encouraging viewers to cook healthy dishes from scratch on Food Revolution Day, which is a part of the Food Revolution campaign aimed at tackling the issues of child malnutrition and obesity.
Another defence expert has refused to rule out the theory that six-year-old Ellie Butler died from falling off a pink children's stool found next to her in the bedroom.
Her father, 36-year-old Ben Butler, has been on trial for her murder. He denies causing catastrophic head injuries.
Biomechanic Dr Chris Van Ee, of Wayne State University, Michigan, told jurors had she been standing on the stool, Ellie's head would have fallen 50 inches before hitting the ground.
He said it was possible a fall from that height could have caused the injuries, but said such cases were uncommon.
On a second report he had written which dealt with medical evidence suggesting Ellie suffered two impacts to the head, he said: "If there is more than one impact, then the fall does not explain it."
Asked whether it would have made a difference if Ellie had been jumping at the time, the academic said: "It cannot add to the fall much but it could explain her loss of balance."
Mr Butler appeared agitated in the dock during cross examination and muttered "blah, blah, blah"
The trial was adjourned until Monday when Ellie's mother Jennie Gray will give evidence. The 36-year-old denies child cruelty charges.
Many women in jail suffer from mental health problems, but with the prison system under pressure there are concerns some do not get the care they need.
Crystal Palace winger Yannick Bolasie shows Football Focus his rapping skills ahead of tomorrow's FA Cup final against Manchester United.
BBC News Channel
Sally Caddle, YMCA youth centre manager which is based near the scene of the attacks in Hampton described what happened to BBC News reporter Sophie Long.
"I heard a scream and ran out to the car park to see what was happening and heard a young lady saying she’d been stabbed.
"I went to stem the bleeding that was coming from her back. I helped a second woman as well who’d had an injury.
"One of the Sainsbury’s staff came out of the store to assist and quite shortly the emergency services arrived."
She added it was a "very strange occurrence to happen in this quiet, suburban, residential area of greater London, one of the nicer parts of the borough. It’s not something that happens everyday here.
Crystal Palace take on Manchester United in the FA Cup final tomorrow evening.
The BBC has coverage throughout the day in the build-up to the match, and BBC Radio London has got in on the action with a special programme ahead from 15:00 which will see Gary Crowley talk to Crystal Palace chairman Steve Parish and ex-player Mark Bright, who scored 91 goals for the club in 227 appearances.
London commuters should be allowed to book a GP appointment online at any surgery in the city, a report by London Assembly member Andrew Boff says.
The Conservative member said commuters often have to take time off work to attend GP appointments and can face waits of days and even weeks for convenient time slots.
The approach is modelled on existing pilots such as those in Barking and Dagenham, Southwark and north-west London.
One woman is critically ill and three others have been injured after they were stabbed near a supermarket car park in west London.
BBC Home Affairs Correspondent
At the Old Bailey where Ben Butler is on trial for murder of daughter Ellie, six, a defence expert says her head injuries could have been caused by a fall.
Dr Chris Van Ee said children can fall from 50 inches and suffer skull and head injuries. It's "uncommon" but "possible", he says.
But under cross examination Dr Van Ee said he hadn't seen all the post-mortem examination photos and couldn't say if the fractures showed one or two impacts.
Eurostar has reported a fall in passengers using the high-speed rail service, saying travellers "remain cautious" in the wake of the Brussels terror attacks.
Passenger numbers fell to 2.2 million in the three months to the end of March from 2.3 million a year earlier.
The firm operates services from London St Pancras.
Blood stained clothes could be seen on the ground and a forensic officer was examining the area. One of the victims went to a police office, less than 100 yards from the car park, where she was treated.
The car park of the Sainsbury's store backs on to a pub, youth centre, children's hospice and school.
A spokeswoman for the supermarket said the store was open.
BBC News Channel
On BBC News, local business owner Ben Brady said: "I was in the shop and I heard a lot of commotion outside, and we are based next to the community police centre and I saw some passerby helping a lady there who had been stabbed.
"They laid her down on the floor and she seemed to be trying to catch her breath but couldn't and then I kept hearing people shouting that there was someone in the car park with a knife, and I went over there to see if I could help out and stop him from attacking anyone else.
"I then saw another two ladies at the back of their car, they both were suffering stab wounds to their sides and back and they were screaming and pointing he's over there he's over there.
"I saw this guy running off, but I'm not sure if he was the person himself ."
He added police officers told him that after he attacked the women, he was "walking down the road waving the knife around".
"They eventually arrested him on the road outside the primary school."
BBC London Travel
BBC Radio London Travel
A resident of Partridge Road said: "I'm appalled and absolutely horrified. It's just so scary, this is a quiet area and it's not at all what you think is going to happen in Hampton.
"It's just horrible, that poor, poor woman."
One of the victims is said to have raised the alarm at the nearby police station after she was attacked.
The attack was right next to a primary school, and the incident happened half an hour or so after the drop-off this morning.
I’ve talked to a few parents who say that the school is completely on lockdown.
The children are not being allowed outside, the parents are not being allowed into the school to see their children.
Apparently the school wants to get the children as calm as possible before they let them go home at 15:30.
To recap, four women were stabbed this morning in Hampton, south-west London.
One woman was air lifted to hospital with life threatening injuries, while another three are being treated after they were stabbed in the chest, legs and back.
A man in his 60s has been arrested.
BBC reporter at the scene Ben Moore said a lot of people from nearby houses have come out to voice their shock of what has happened.
The car park has been closed while police officers investigate.
The father accused of murdering his six-year-old daughter has said he was not getting "a fair trial".
Ben Butler, 36, made the comments from the dock after his medical expert was stopped by the judge at the Old Bailey who said it was improper to "spring" evidence without notifying the prosecution in advance.
The judge interrupted the evidence again, saying he was "uncomfortable" about the doctor "straying beyond her expertise".
Neuroradiologist Dr Mack, from Penn State University of Medicine, told jurors that scans of Ellie's head showed recent and older injuries, including skull fracture, swelling and bleeding.
She added that she could not date healing calcification of earlier injuries, but literature she had seen suggested it could be as little as two weeks old.
Dr Mack dismissed an earlier expert witness suggestion that Ellie suffered more than one impact.
Mr Butler denies murder and child cruelty.
BBC London News
It will be fine and mostly dry this afternoon, with bright or sunny spells.
It'll feel pleasantly warm in the sunshine, however cloud will increase from the west later in the day.
Highs of 18C (64F)
BBC London presenter
Coming up on BBC London this lunchtime: We have exclusive access inside Holloway prison as fresh concerns are raised over the number of inmates suffering from mental health conditions.
And could Crystal Palace make history this weekend? They're taking on Manchester United in the FA Cup Final at Wembley tomorrow. If they win it will be their first ever major trophy.
Join me at 13:30 on BBC One.
An employee at Tangley Park Children's Centre, which backs onto the scene of the stabbing, said: "We kept all the children safe and kept them in the building until we knew it was safe.
"It's just such a shock - our parents and children could have been walking to their cars at that time.
"Our sympathies go out to everyone who was hurt and we are really glad none of our families were involved."
A worker at the nearby Hampton Pub said the knife man was only targeting women in the unprovoked attack.
The woman, who did not want to be named, added: "He only went for the women.
"The man ran through and started attacking them. It didn't seem like they knew him it was completely unprovoked."
She said if it had been 10 or 20 minutes earlier there would have been children there because it's right outside a primary school.
"The woman who was badly stabbed in the back made it up to the police station and raised the alarm," the pub worker added.
"She is well-known locally and always goes shopping there all the time."
The Met said one woman who suffered knife wounds was found at a nearby property. She has been taken to hospital in a "life-threatening condition".
A man in his 60s was arrested at the scene on suspicion of attempted murder and is currently in custody at a south-west London police station.
The force said at this early stage the incident is not believed to be terror-related.
London Ambulance said it was called just after 10:30 to reports of stabbings near The Avenue, Hampton.
“We treated four women at the scene for various stab wounds including to the chest, legs and back," said a spokesman.
"We took three women as a priority by road ambulance to a major trauma centre in south London.
"The air ambulance took the other woman as a priority to another major trauma centre in central London”.