Emma Thompson is to portray the Queen in a TV drama based on the famous Buckingham Palace break in which took place 30 years ago.
Intruder Michael Fagan sneaked into the palace and managed to find his way into her bedroom, sitting on her bed and chatting for ten minutes.
The incident has been adapted for a film called Walking The Dogs, to be screened by Sky Arts in the spring.
Fagan, who was 31 at the time, was initially charged with the theft of some wine from the palace but the charges were later dropped and he went on to be detained for several months in a psychiatric hospital.
His encounter with the Queen was actually his second visit to the royal household, after previously scaling a drainpipe and scouting round the corridors before leaving.
The Queen engaged Fagan - who was bleeding after he broke an ashtray - in conversation until help arrived.
Photo: © Getty