The
BBC have this item from their
On This Day pages:
1955: Queen opens London Airport terminal
The Queen has inaugurated new buildings in the centre of London Airport, part of a new complex designed to handle a growing number of air passengers.
Her Majesty arrived by car with the Duke of Edinburgh and was greeted by a guard of honour made up of air crews from the British and Commonwealth airlines, headed by BOAC Captain JT Percy.
This was, of course, the Queen's building.