Dame Helen Mirren yelled at a group of street drummers to be quiet while still dressed in her stage costume as Queen Elizabeth II, it has emerged.

The incident took place in London on Saturday after a parade promoting a gay and transgender festival paused on Rupert Street, but continued to drum.

Dame Helen, on stage in the Audience at the nearby Gielgud Theatre, eventually emerged in full costume.

She says she used "thespian words" to tell them to be quiet.

Orange Nation, organisers of the One in the Park festival, said in a statement that Dame Helen had been dressed in pearls and a tiara when she emerged from a stage door and demanded that the noise should stop.

"Clearly angered she shrieked, 'Quiet! I'm trying to do a play in here! People have paid a lot of money for tickets'," it said.

What, like 'forsooth'?