British Airways has warned its services will be severely impacted over the coming days after the closure of Heathrow Airport.Chief executive Sean Doyle described the situation as "unprecedented", with more than 100,000 of its customers on board some 670 flights being affected on Friday.

British Airways has warned its services will be severely impacted over the coming days after the closure of Heathrow Airport.Chief executive Sean Doyle described the situation as "unprecedented", with more than 100,000 of its customers on board some 670 flights being affected on Friday.