Sean Dilley
Travel correspondent

Travel problems are going to be slightly longer-lasting for some people.

Diversion to Holland, to Frankfurt, all the way to Manchester for the lucky people who can get trains and coaches down.

Meanwhile, planes parked up in different airports around the world now have to be relocated.

Gatwick Airport had said it would step in and help as much as it can, but it is at capacity and it's not realistic to think it will be able to take on much more.

There are other airports in the London area, such as Stansted and Luton, but capacity is still limited.

Don't even think about travelling to Heathrow Airport whilst it is closed. It is a waste of your time and it will cause more difficulties for emergency services tackling the blaze near the airport.

We can now bring you a look at the scene inside Heathrow while the airport is experiencing a massive power cut.

Pictures show darkened corridors and emergency lights.

It's not just flights - trains around Heathrow are also being disrupted today.

The Heathrow Express, which connects the airport with Paddington station, says there are no services in either direction today, and is advising people not to try and travel to the airport.

On the Elizabeth Line, Transport for London says there is no service between Hayes & Harlington and Heathrow Airport, with severe delays between Paddington and Hayes & Harlington.

So far, Transport for London says that there is good service on the Piccadilly Line.

We've just had another update from National Grid, which says that as of 06:00 GMT power had been restored to 62,000 customers, with 4,900 still without power.

As we reported earlier, it says a fire at its North Hyde substation in West London had damaged equipment and caused a loss of power supply to some areas.

"We are working at speed to restore power supplies as quickly as possible," National Grid says in a post on social media, external, adding "restoration efforts will continue this morning and further updates will be provided."

We can now bring you some of the latest images near North Hyde electrical substation, where emergency services have been operating since the early hours of Friday.

Photos show emergency vehicles filling the streets and firefighters working near the site.

Image source, Getty Images

Image source, PA Media

Image source, Getty Images

Image source, PA Media

Simon King
BBC weather presenter and meteorologist

My mum has been in Jamaica for a big birthday over the last week and was due to arrive back at Heathrow this morning.

I’ve woken this morning with a message from her while in the air to say they have been told that because of an "incident at Heathrow", they are flying back to Montego Bay airport.

After travelling almost half way across the Atlantic, they were told that "no airport in Britain could take us so we just had to turn around".

They are still in the air. She is guessing it’ll take a while to figure out now what will happen when they arrive back in Jamaica - or when they’ll eventually get home.

The implications will stretch far wider than Heathrowpublished at 07:15 Greenwich Mean Time 21 March

07:15 GMT 21 March

Sean Dilley
Transport correspondent

Airports and airlines have two key challenges as emergency services work to establish the cause of the nearby fire. First, what on earth can they do to limit the damage to travellers and the economy?

The second challenge extends beyond today. Flight plans are meticulously orchestrated and choreographed to make sure aircraft are in the right place at the right time.

Aircraft will be parked in far-flung airports, passengers will have questions and authorities will be keen to understand the impact of the disruption.

The implications will stretch far wider than Heathrow, and could impact flights much further afield.

Sean Dilley
Transport correspondent

The term "nightmare" is too weak of a descriptor to paint a true picture of the chaos this will cause.

Every type of crisis meeting you can imagine is taking place as authorities at Heathrow, and at airlines who rely on the world's second-largest airport, work furiously to implement backup plans.

There’s a contingency plan for everything, but the issue for flight planners, airlines and airports across the UK and Europe is encapsulated by one word: capacity.

Gatwick has already said it will help as much as it can, but I was standing on the controversial north runway just a few weeks ago, 200m (656 feet) away from the airport's only operational runway. A flight was taking off and leaving around every one minute and 10 seconds.

We were talking expansion that day - but the bosses made it clear, Gatwick is slammed. It’s full. Its ability to help will be highly limited.

Airports in Europe and in the UK are already pitching in. Some passengers have been diverted to Manchester; no doubt they are sighing a breath of relief to be just hundreds of miles away from their intended destination.

Your Voice, Your BBC News

Have your flights been cancelled, diverted or delayed due to the Heathrow Airport disruption? Or have you been evacuated from your home in west London after the fire at the Hayes electrical substation?

If so, you can get in touch via Your Voice, Your BBC News.

Send us your story at www.bbc.co.uk/yourvoice, email bbcyourvoice@bbc.co.uk or WhatsApp +44 7756 165803.

Charlotte Gallagher
Reporting from Heathrow Airport

We’re on a bridge overlooking the entrance to Terminal 2 and 3.

It should be full of cars and taxis taking passengers to and from the airport but it’s deserted.

Some people seemingly didn’t hear the airport shut and were queuing at a roundabout nearby - police were there to turn them around though.

Peter Hoskins
Business reporter, BBC News Singapore

Image source, Getty Images

Amsterdam's Schiphol Airport says that around 30 flights are scheduled to and from London Heathrow today.

"At this moment, half of them have been cancelled", it said.

So far, one flight has been diverted to Schiphol.

Peter Hoskins
Business reporter, BBC News Singapore

Hong Kong's main airline Cathay Pacific says flights CX239 and CX253 from Hong Kong to London today have been cancelled.

All Cathay flights from London to Hong Kong have also been cancelled, the airline added.

"We are assessing the situation and will keep our customers informed with the latest updates," it also told the BBC.

Image source, Cathay Pacific

Thomas Mackintosh
Live reporter

Never a dull time following the Tartan Army!

After the match last night we were kept back by Greek Police for 45 minutes so didn’t leave the ground until just after 00:30 local time. We microwaved some sleep and were up for 5:30 (03:30 GMT) - only to be told our original flight had been cancelled.

We have been fortunate enough to get a seat on another flight to Gatwick. These certainly aren't cheap seats, but we’re glad to be on a flight bound for London!

For us, it meant having to check-in with another airline, then go through passport control and security again. The layout of Athens airport is one where you must clear passport control as the next step after you first scan your boarding pass at departures.

So, we had to get another stamp on our passport and a little mark from the border control officer to signal our situation.

We know of a few other Tartan Army friends who have tried to get flights back to Scotland via Dublin, Milan, and Rome. I’ve even heard Istanbul mentioned - so it gives you an idea of the fresh travel plans people are having to draw up and fork out for.

Malu Cursino
Live reporter

It's after 06:30 GMT in the UK and all flights to and from Heathrow Airport have been cancelled until midnight tonight following a fire at the nearby North Hyde electrical substation.

As yet, there is no electricity to the airport and nearby homes and businesses. More than 100 people were evacuated.

The full knock-on impact is still being assessed, as flights scheduled to come into the UK via Heathrow had to be cancelled.

More than 1,300 flights around the world have been affected.

A Heathrow spokesperson said its terminals had to be shut as they "do not have clarity on when power may be reliably restored".

The London Fire Brigade says around 70 firefighters were tackling the blaze in the west of London.

Image source, Reuters

João da Silva
Business reporter in Singapore

Air India says its London-bound AI129 flight is returning to Mumbai.

Another flight - AI161 from Delhi - is being diverted to Frankfurt. All other remaining Air India flights to and from London Heathrow on 21 March have been cancelled.

The company's flights to London Gatwick remain unaffected.

"We will update about resumption of operations as soon as we have more information," a statement from the airline said.

Charlotte Gallagher
Reporting from Heathrow

Heathrow will be closed until midnight on Friday but the airport is warning of “significant disruption” in the days after that.

Aircraft and crews will be in different locations as flights have been diverted or in some cases not even left a runway.

It will also have to deal with the huge influx of passengers when the airport reopens.

National Grid says in a post on X that the fire at North Hyde substation has "damaged equipment, leading to a loss of power supply in the area".

"We are working at speed to restore power supplies as quickly as possible and will provide an update as soon as we can," the statement says.

We're now hearing from the London Fire Brigade that the blaze at the electrical substation in Hayes has not been extinguished.

"Part of a transformer within the substation remains alight," an update on social media from the London Fire Brigade says.

Firefighters are "working tirelessly" to bring the blaze under control, the statement adds. "As we head into the morning, disruption is expected to increase, and we urge people to avoid the area wherever possible."

Ten fire engines and around 70 firefighters have been dispatched to the site. The cause of the fire remains unclear at this point.

Suranjana Tewari
Asia business reporter

I was booked to fly into Heathrow from Singapore tonight.

I am travelling alone with my six-year-old and so opted for an overnight flight to hopefully allow the 15-hour flight to go a bit quicker.

I contacted Qantas to check if the airline is diverting my flight but it said there has been no word yet. Separately, Qantas has told the BBC my flight is likely to be impacted.

I've been checking alternative flights to Gatwick or Manchester to see if I can get ahead of any delays.

There are few direct options. But Singapore Airlines to London Gatwick for two of us is costing about $3,000 (£2,320) at this late stage! My travel insurance will only cover the cost of my original flight, and only if the airline sends us written proof that it is cancelling or diverting.

In the last few minutes, I've received the below message saying Qantas looks forward to welcoming me onboard.

I'm sceptical as any delays at busy airports like Heathrow are likely to last for days. But I guess I'll take my chances by heading to the airport in the coming hours - along with a very sleepy child.

Peter Hoskins
Business reporter, BBC News Singapore

London Gatwick Airport has just shared a new statement confirming it is offering support by "accepting diverted flights as required".

"Flights are operating from London Gatwick as normal today," the airport added.

It said it has already "accepted seven diverted flights originally scheduled to land at Heathrow".