Bullock said: "Leading the team at Heathrow is an intense and demanding role, but one I have enjoyed very much. The managing director role will change substantially under the new structure being introduced by BAA’s chief executive Colin Matthews. While I understand and support those important changes, the time is clearly right for me to move on and take on new challenges."
Bullock will be replaced by Mike Brown, the current chief operating officer of London Underground, who will join BAA in September. Until then, the airport will be run by acting managing director Terry Morgan.