The farcical sight of Rupert Murdoch being attacked within the Houses of Parliament, whilst giving Select Committee evidence, turned an already embarrassing day for Britain into an excruciating international humiliation.
It is not the first time high-profile individuals have been attacked in supposedly one of the nation's most secure environments.
Put simply, the Sergeant at Arms team and police presence, again got lucky yesterday. No overall harm was done, except by way of an appalling dent to Britain's reputation just months before this country is due to host the Olympics and Paralympics.
Whatever their rights or wrongs, quite how Rupert Murdoch and his family were positioned without close and alert security (particularly to their left, where the attack against the eighty year old media proprietor was launched) in front of essentially a public meeting, running live across dozens of international news networks, is a national disgrace without any mitigation.
Further, why is took several seconds for any security related staff to assist the alert and effective intervention by Wendy Deng (Murdoch's wife), should merit sanctions, mandatory retraining and even an overall review of service provider.
That is, assuming any House of Commons security staff or police present, have ever received training around personnel security and risk assessments in the first place. Moreover, given the profile and individuals involved in yesterday's event, what planning, what rehearsals and what threat assessments took place to ensure participants would not be sabotaged or attacked?
These are questions and answers that the Speaker John Bercow needs to get to grips with fast. Otherwise potential witnesses to Select Committees, who are often high-profile and unpopular with significant numbers of the public, will rightly refuse to appear.
Moreover, in a small room, with just a few dozen members of the public, how could it be possible for a shabbily dressed, nervous looking 26-year old man (the age profile being an even bigger clue), who was already 'twittering' suspicious codified messages to the outside world, not already be scanned and picked up as 'one to keep an eye on' at the very least?
A simple and anonymous repositioning of a security guard between the Murdochs and the suspect to create a barrier would probably have sufficed at this point.
If trained specialist operation Met Police officers can routinely and successfully scan thousands of hands and faces on huge Royal visits (a la Prince William and Kate's visit to Canada this month), why is it that the Houses of Parliament security teams can't protect its own witnesses and members within the walls of it own fortress?
The solution is not, as was done yesterday, to throw out members of the public, who through taxation pay the salaries of Houses of Parliament security and the MPs they elect to serve them.
Furthermore, members of the public should not be 'vetted' by some Byzantine pre-selection method for attendees that could all-but wipe out the rights of many of us (with recorded inconvenient political opinions, or simply a spontaneous desire to witness our democratic system) to attend.
The physical security measures going into Parliament, including secreening, ensure that a trained terrorist may well be able to get into Parliament to see MPs, but could do little more than shout and holler like the rest of us once inside because presumably they could not get any equipment in.
For solutions to personnel protection you don't have to look much further than Rupert Murdoch's wife.
At all times she remined as close as possible to the main target yesterday, her husband. She remained alert even after two hours. She then activated an intervention in under a second by neatly moving her husband out of the way with her right hand whilst chopping some impressive slaps accurately at the offender with the other.
Meanwhile the House of Commons security were shamefully nowhere to be seen. Perhaps, they along with the rest of the world, were marvelling at the free close protection training that they very much need to receive.
Richard Bingley is Chief Executive Officer of CSARN, the UK's leading business security advisory service. Mr Bingley is a graduate of the Security Industry Authority's elite Close Protection licensed programme and is based in London. He is the author of 'Terrorism: Just the Facts', published by Heinemann.