What are my rights if my flight is cancelled?

Heathrow Airport is closed all day Friday due to a fire at a nearby electrical substation that supplies it with power.

The UKs busiest airport has warned of significant disruption over the coming days, with at least 1,300 flights in and out cancelled.

What are your rights if your journey has been disrupted and can you get your money back?

Do not attempt to travel to the airport, but keep in touch with your airline who will be able to advise you about refunds or booking alternative flights.

If your flight is covered by UK law, your airline must let you choose between either getting a refund or being booked on to an alternative flight.

You can get your money back for any part of the ticket you have not used.

So if you booked a return flight and the outbound leg is cancelled, you can get the full cost of the return ticket refunded.

If you accept a refund, your airline has no further duty of care to you. If you need to make any other arrangements, you will need to do so yourself.

If you still wish to travel, your airline is obliged to get you on a new flight as soon as possible, including with rival carriers from alternative airports.

Bear in mind though, with so many flights cancelled, other airports will be stretched as well.

If there are other suitable modes of transport, such as the train for domestic journeys, then you have a right to be booked on to that alternative transport instead.

If your flight was coming into Heathrow on a non-UK airline, then you should check the terms and conditions of your booking.

If you are stuck abroad or at the airport, your airline is obliged to offer you further assistance, including:

If your airline is unable to arrange assistance, you have the right to organise this yourself and claim back the cost later.

The Civil Aviation Authority advises people to keep receipts and not spend more than necessary.

In this instance you will not be entitled to extra compensation from your airline as the situation will be deemed an "extraordinary circumstance" beyond the airlines control.

If your travel insurance policy includes trip disruption, you should be covered if you have to cancel your travel plans.

The Association of British Insurers advises you to check your policy details and speak to your insurer if youre not sure what is included. You may be able to recoup other expenses such as car hire or airport parking fees.

Any bookings made through a credit card may also have recoverable costs.

Keep in touch with your airline for further information.

Heathrow is closed until at least 23:59 on Friday but has warned customers to expect "significant disruption over the coming days".

The disruption is likely to affect other airports as well as flights are being diverted.

When heavy snow closed Heathrows runways for a day in December 2010, it resulted in more than 4,000 flights being cancelled over five days.

Heathrows helpline number is 020 8757 2700.