Transport chaos is expected to cause misery for travellers this weekend due to bad weather , repair work and a rail strike.
Britain sweltered in the mini heatwave earlier this week- but yesterday rain and storms caused severe transport delays which are expected to continue.
East Midlands Trains customers have been warned to expect a significantly reduced service to and from London due to repair work on damaged overhead line equipment, caused by blistering temperatures of 100F.
A revised timetable is expected on several local rail routes because of strike action from conductors.
Customers have also been told to check before heading out on their journeys and not to travel on the London St Pancras-Nottingham-Sheffield route as there will be a reduced timetable.
A spokesman said that the ongoing disruption to services on the Midland Main Line route to London will continue over the weekend while engineers repair major damage to overhead line equipment near West Hampstead.
Jake Kelly, East Midlands Trains managing director, said: "We're sorry to everybody who has experienced disrupted journeys over the past two days.
"We are working very closely with Network Rail while they work to repair the overhead line equipment and fully reopen the railway, which will in turn allow us to reintroduce our full train service to and from London St Pancras.
"Whilst this work takes place, we do have a significantly reduced timetable in place on our London route over the weekend and our advice for customers is to avoid travelling on this route wherever possible and make alternative arrangements.
"Due to the RMT industrial action, there will also be some changes to services on our local routes on Saturday, with revised timetables and replacement coach operations in place on some lines."
Delays or cancellations to bus services are also possible as more heavy rain is forecast for Saturday and Sunday.
After a week in which Britain has been hit by hot temperatures and thunderstorms, heavy rainfall could now bring flooding and travel disruption.
The Met Office has issued a yellow weather warning for rain which covers vast swathes of Scotland and England, with the exception of the South West region, until Sunday afternoon.
Up to 20mm of rain fell in parts of London and the south-east of England overnight on Friday into Saturday, with forecasters expecting up to another 20mm during the morning, which could lead to travel problems.
The Port of Dover has also warned passengers to expect delays in a tweet.
It wrote: "We are experiencing extremely high volumes of traffic due to the summer holiday getaway. Please allow extra time for your journey, We apologise for the delays."
The weekend's transport problems comes after air passengers suffered major disruption on Friday due to the heatwave and a technical problem with the UK's air traffic control system.
More than 50 flights at London airports were cancelled when an air traffic control radar failed.
Delays started on Thursday evening after storms battered Europe, before continuing yesterday morning.
Staff at Heathrow handed out sleeping bags to scores of stranded passengers.
The blistering heat on Thursday caused overhead rail power cables to sag - resulting in them being damaged by passing trains which will take days to repair.
And speed restrictions across the rail network were put in place to prevent lines from buckling in the heat.
The Eurostar services from London to Paris were severely delayed as a result of damaged overhead power cables and a blaze.
There were heavy tailbacks on the M25 at Dartford due to downpours and heavy traffic
The flight radar problem was explained by air traffic control company Nats as a technical problem with a system at the Swanwick Air Traffic Control Centre.
Eurocontrol, the European air traffic co-ordinating agency, said delays were being caused by an "issue with radar displays".
The agency added there will be "high" levels of delay for flights arriving at Heathrow and Gatwick.
Heathrow advised customers to speak to airline providers for more information.
British Airways announced "severe thunderstorms" were causing "significant delays and cancellations" in the early hours of Friday.
Heathrow passenger who decided to stay away from Heathrow took to social media to complain of 'terrible informatio'n from British Airways.
One said: "My sister with her little kids is stuck in a plane for 10 hours and it never took off."
Thursdays weather was the second hottest ever recorded in UK history.
