The Foreign Office has chartered a special plane to fly stranded British holidaymakers home from Thailand.
The plane with survivors on board will leave Bangkok at 1000 local time
The 291-seat British Airways jumbo jet will leave Bangkok for London Heathrow on Saturday 1 January at 1000 local time (0300 GMT).
Those who need seats on the rescue flight should call the British Embassy in Bangkok on Friday 31 December between 1200-2100 local time.
Places will be allocated to those affected by the disaster.
For those who wish to register their interest with the British Embassy in Bangkok, the phone number for people in Thailand to call is 023058333.
The Foreign and Commonwealth Office will try to contact relatives of those on board the plane so they can meet them on their arrival at Heathrow.
Priority is expected to be given to those worst affected by the disaster.
A BA spokesman said: "The Foreign Office will fill the plane with people who have lost loved ones in the disaster and passengers could also include backpackers."
Bodies may be sent back
BA are also sending staff from across Asia and Australia to help with the flight and are sending a medical team from the UK.
BBC correspondent Chris Hogg said the plane to London may also be used to bring back some of the bodies of tourists killed by the floods.
Meanwhile two reception centres have been set up in Terminal 3 and 4 at Heathrow Airport.
They are meant to assess the needs of those returning from areas hit by the tsunami, and provide them with advice, counselling and support.
They are staffed by aid agencies personnel including the Red Cross, which is providing medical advice, treatment and clothing, the Metropolitan Police Service and London Ambulance Service.