Barschak was said to be trying to promote his comedy show

He is to make a statement to the Commons on Tuesday after considering a six-page report on the incident by police.

Self-styled "comedy terrorist" Aaron Barschak, dressed as terrorist leader Osama bin Laden in a pink ball gown, scaled a wall at the castle and talked his way past police.

He then mingled with guests including senior royals before jumping on stage as Prince William made a speech.

HAVE YOUR SAY Perhaps some basic observation training wouldn't go amiss! Dave, London, UK Send us your comments

Police have apologised to the Royal Family over the incident, which Scotland Yard Commissioner Sir John Stevens described as an "appalling" breach of security.

The Tories are angry that the home secretary has chosen to speak to the media before making his statement.

Mr Blunkett says he wants to see that "lessons are learned" from the incident.

'Heads on block'

Asked if heads would roll over the security breakdown, the home secretary said: "There is no question that after what happened, everyone in every position all the way through counter-terrorism forces and royal protection know their heads are on the block.

"I'm not at the moment looking for scapegoats, I am looking for answers to very difficult questions."

I think we deserve better from those who are employed to look after our interests David Blunkett Home Secretary

Despite the need to re-assess security of the Royal Family, Mr Blunkett said he was confident the Queen and other Royals were safe.

Shadow home secretary Oliver Letwin said it was outrageous that MPs had to wait for a statement.

"I put down an urgent question today asking the Home Secretary to make a statement in the House of Commons. He has chosen instead to make a statement to the press."

In a point of order in the Commons, shadow leader of the House Eric Forth added: "Is this yet again not a defiance of Mr Speaker's rulings that ministers should not go out and tour the media studios before they come to this House of Commons to give an account of themselves?"

Metropolitan Police Assistant Commissioner David Veness said Mr Barschak had climb