Cargo volume passing through London Heathrow in 2015 was 1.5 million tonnes, in line with last year, said the airport operator. There was growth to Asia, particularly Hong Kong and China as well as new capacity to Vietnam, it added. Over a quarter of UK exports by value pass through the gateway.

Heathrow also reached its highest-ever passenger total, 75.0 million, up 2.2%. Total revenue was £2,765 million, up 2.7% and earnings before interest, tax depreciation and amortisation (EBITDA) was £1,605 million, up 3.0%.

While Heathrow is currently capacity constrained, Garuda Airlines is due to move its London services from Gatwick this year, following previous similar moves by Vietnam Airlines and Air China. Demand to fly from Heathrow continues to outstrip supply of slots, the airport said in a statement.

Heathrow has been lobbying hard to be allowed to build a third runway to relieve its capacity problems. The oft-postponed Government decision on the issue is now expected in the summer.

Chief executive John Holland-Kaye, said: “It’s been an excellent year for Heathrow. As we approach our 70th anniversary, our colleagues are delivering the best service we’ve ever achieved…I’m confident that this summer the Government will agree with its Airports Commission that expanding Heathrow is the only way to secure Britain’s long-term economic future and meet environmental demands. We stand ready to deliver.”