An “angry pig” confronted engineers in a London street, delaying their repair of a burst water main before it was led away with a bag of crisps.
The pipe burst on Lamberts Road, Surbiton, damaging nearby railway equipment, which caused train delays.
Thames Water said their efforts to reach a valve to cut the water were initially hindered by “a large pig” which was “acting aggressively”.
It is not known what flavour crisps were used to lead it away.
Damage caused by the flooding of tracks and signalling equipment meant limited trains have been able to run along the line.
Disruption is currently expected to last until 16:00 GMT although Network Rail said engineers were carrying out inspections.
Thames Water said engineers “were quickly on site” to deal with the burst 120cm (48 in) pipe, but they had been unable to initially carry out the work because of the pig, which is thought to be someone’s pet.
Passengers are facing travel disruption after an entire London Underground line was suspended due to a signal systems failure at the main control centre.
One commuter tweeted that he “hated the Northern Line”, which was suspended just before 06:00 BST.
More than 800,000 people use the Tube line, which connects transport hubs Waterloo, Kings Cross and Euston, every day.
Transport for London said it was “working hard to restore the service”.
Tube tickets are being accepted on Southeastern and Thameslink trains, as well as on trams and buses.
Both the Bakerloo and Metropolitan lines also have minor delays as a result of the signals failure.
The delays come as schools open for the new term this week and commuters on social media complained of having to queue to access stations.
Brian Woodhead, London Underground’s director of customer service, said: “I am extremely sorry for the disruption suffered by customers on the Northern line today following a signalling system failure at our control centre.
“Our engineers are working hard to fix the problem and restore a full service as quickly as possible.”
Heavy downpours across England are causing major disruption for road and rail users.
Network Rail said some areas had seen two months’ worth of rainfall in one day with drains overwhelmed.
Rail operator Southern has advised people to avoid travelling, delay journeys or use alternative routes.
A total of 31 flood alerts are in place across the country, with some areas set to see up to 60mm of rain, particularly over the first half of the day.
Southern tweeted that “train services running across the whole network will be cancelled or delayed”.
A Network Rail spokesman said engineers were “out in force” pumping water away from areas.
“Across the south east, we suffered over a month’s worth of rainfall in just one day and in some areas the downpours equated to two months’ rain,” he said.
“We’ll continue working to keep passengers moving and then we’ll review the drainage systems which have suffered problems to see if we can do any more to avoid similar incidents in the future.”
In Horncastle, Lincolnshire, the River Waring was transformed into a raging torrent after hours of heavy rainfall.
Police in the town warned motorists and pedestrians that “great care” was needed “due to the large amounts of surface flood water and rising drains and rivers”.
Leicestershire Police said it had received a “high level” of calls about blocked roads, while a driver narrowly escaped injury when a tree fell on his car in Thurnby.
A woman in her 80s and her dog were rescued from a flooded property in West Kingsdown, near Sevenoaks in the early hours.
Kent Fire and Rescue Service said she had been trapped in her home up to waist height.
The Environment Agency said some areas of Kent recorded about 100mm of rain in the 24 hours up to 07:00 BST.
The average rainfall for the entire month of June in the UK is 73.4mm, it added.
The M25 was closed in both directions for almost eight hours earlier after two sinkholes were discovered following a crash at about 23:30 BST.
In Devon, a thatched house caught fire when it was struck by lightning overnight. No-one was injured in the blaze.
Exmoor is likely to see up to 40mm of rain on Tuesday but could have up to 60mm.
Rain has also hit the Cricket World Cup for the second day in a row as Bangladesh’s game against Sri Lanka in Bristol has been delayed.
BBC Test Match Special’s Simon Mann said: “It’s a grim scene. Play today is extremely unlikely.”
Pilgrim Hospital in Boston, Lincolnshire, has also been hit by flooding but health bosses said patient services were “unaffected”.
Fire crews have been in attendance since 03:00 pumping water out of the hospital’s boiler room.
Met Office meteorologist Alex Burkill said the UK was in for “some treacherous weather”.
Weather warnings are expected to remain in place for much of the day, with forecasters predicting parts of the UK could be inundated during the rest of the week.
North-eastern parts of England and the Midlands are expected to bear the brunt of the downpours on Tuesday, with a yellow warning in place until midnight.
The Environment Agency has issued 31 flood alerts and one flood warning.
The Met Office said some parts of the country could see 60 to 80mm of rain on Wednesday and Thursday, possibly up to 100mm.
Mr Burkill described the figures as the “worst-case scenarios”.
“If you add it all up some places are likely to see over 100mm this week, which is around double the average they would get in the whole of June,” he added.
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