The BBC was forced to offer a humiliating apology to the Queen over claims that she stormed out of a photo shoot. She is said to be livid at the way documentary footage was manipulated to make it appear she had flounced out of a portrait sitting with American photographer Annie Leibovitz. The corporation has admitted that the footage of her alleged exit was in fact filmed as she arrived for the session. Phone lines between Buckingham Palace and the BBC were said to have been "red-hot" amid fears that the corporation had turned the Queen into a laughing stock. Politicians and senior BBC figures have called for heads to roll, claiming the trailer footage unveiled on Wednesday showed a flagrant lack of respect for the monarch. The BBC Trust, which replaced the board of governors earlier this year, has called on director-general Mark Thompson to explain how the blunder happened. A senior palace source said: "It is fair to say that the Queen's aides are hopping up and down about this - and she is far from amused herself. It is unprecedented for the Queen to allow herself to be filmed so candidly. She only agreed to it after the success of the BBC's documentary two years ago on Windsor Castle. To suggest that she would be so discourteous as to walk out on a photographer is completely untrue. She hasn't been tempted to do such a thing in 55 years on the throne and certainly wouldn't start now."