The head of British Airways’ parent company was not given any warning the third runway at Heathrow would involve the demolition of his companys’ multi-million-pound offices.

British Airways is the biggest customer at Heathrow and its owner company IAG is responsible for around half of the flights at the airport.

Yet chief executive Willie Walsh only found out his company's HQ would be razed after he looked at a map, he has said.

“We were never actually informed or advised by Heathrow that they intended to knock down our headquarters,” he told The Guardian.

“The first I saw of it was when the Airport Commission report came out and I saw a map and I thought: that looks very close to Waterside.

“Then I discovered it actually went right through Waterside.”

IAG and British Airways are based in a business complex in Harmondsworth that was constructed in 1998 for £200m.

The office space sits in a 115-hectare man-made park and is equipped with its own travel centre, beauty salon, 400-seater auditorium and Waitrose supermarket.

Mr Walsh fears IAG will effectively have to pay for the demolition of its own HQ, since although the properties cleared to make way for the runway will be bought for 25 per cent more than their market value, airlines are likely going to have to pay far more to the Civil Aviation Authority to compensate for the expansion costs.

Heathrow replacement to be dreamed up by leading architectural firm Show all 2 1 /2 Heathrow replacement to be dreamed up by leading architectural firm Heathrow replacement to be dreamed up by leading architectural firm Foster and Partners Heathrow replacement to be dreamed up by leading architectural firm AFP PHOTO

October's decision to expand the airport at Heathrow has caused uproar among environmental campaigners and residents in the area.

Up to 4,000 residents in the area could lose their homes.