Over 270 of Britain’s business leaders signed an open letter to the prime minster demanding the government implement the Airports Commission’s clear and unanimous recommendation to expand Heathrow. The letter – sent from signatories ranging from FTSE chiefs and Britain’s key business and trade associations, to leading global brands and SMEs spanning the whole of the UK – sends a clear message that UK business growth and productivity is being held back by lack of capacity at Heathrow.