Heathrow airport feels crowded because British and EU travellers walk on opposite sides and keep bumping into each other, its chief executive has said. <img src="https://imagedelivery.net/phxEHgsq3j8gSnfNAJVJSQ/node3_7024d994-7d1c-4284-8b11-5f10d4d446c7/public" style="background-color:initial;max-width:min(100%,1392px);max-height:min(532px);;background-image:url(https://imagedelivery.net/phxEHgsq3j8gSnfNAJVJSQ/node3_7024d994-7d1c-4284-8b11-5f10d4d446c7/public);height:auto;width:100%;object-fit:cover;background-size:cover;display:block;" width="1392" height="532">