Heathrow Airport Holdings Limited?s owner has opened the door to selling its stake as the fate of the airport?s third runway hangs in the balance. A top executive at Spanish infrastructure giant Ferrovial SE (BME:FER) said it would look at the merits of offers if bidders ?keep knocking on our door?. The remarks by Ferrovial Chief Financial Officer Ernesto Lopez Mozo come amid claims that buyers are being informally sounded out about acquiring a 25% stake in Heathrow.

?They?ve been testing the market to see who might be interested?, one senior City source said.