Here's the original in The Independent:
New criminal powers will make it an offence punishable by up to six months in prison to break through security cordons and mount protests inside a series of sensitive government buildings, and royal palaces including the Palace of Westminster.
The offence was created in response to a security breach by self-styled "comedy terrorist" Aaron Barschak, who gatecrashed Prince William's 21st birthday party at Windsor Castle dressed as Osama bin Laden in 2003. It followed a report into that breach of security by Commander Frank Armstrong of the City of London police.
...
The clampdown on protests inside the Houses of Parliament follows the demonstration staged by five pro-foxhunting protesters including Otis Ferry, the son of rock star Bryan Ferry while MPs debated the ban on hunting with dogs. It could be applied in future to the Fathers4Justice who climbed the roof of Westminster Hall to protest about lack of access to their children.
...
The restrictions will apply to Portcullis House, the recently-built extension to the Commons, where MPs have their private offices. It also extends to the headquarters of MI5, MI6, the Ministry of Defence, and the listening post at GCHQ Cheltenham. It will not ban protesters outside the security fences.
http://news.independent.co.uk/uk/legal/article2611749.eceI'd have thought there was something they could have been charged with anyway - the all-encompassing 'breach of the peace', or perhaps '
aggravated trespass':
A person commits aggravated trespass if he trespasses on land with the intention of disrupting, or intimidating those taking part in, lawful activity taking place on that or adjacent land.
which, for instance, would apply to the House of Commons protesters. Though the Wikipedia page for Aaron Barschak does say he was never charged for getting into Windsor Castle.
In fact, what this is doing is introducing the charge of 'criminal trespass' for these sites - a law that the US already has - see eg
What the law did, in 2005, was allow the government to specify areas in which trespass became criminal. So far, these have been military sites, nuclear sites, and now they've added various royal and government sites, with a few spying places, on the 1st June:
* 85 Albert Embankment, London;
* Buckingham Palace, London;
* Ministry of Defence Main Building, Whitehall, London;
* Old War Office Building, Whitehall, London;
* St James’s Palace, Cleveland Row, London;
* Thames House, 11 and 12 Millbank, London;
* The Chequers estate, near Aylesbury, Buckinghamshire;
* 10 – 12 Downing Street site as well as 70 Whitehall;
* Government Communication Headquarters, Harp Hill, Cheltenham;
* Government Communication Headquarters, Hubble Road, Cheltenham;
* Government Communication Headquarters, Racecourse Road, Scarborough, North Yorkshire;
* Government Communication Headquarters, Woodford, Bude, Cornwall;
* Highgrove House, Doughton, Gloucestershire;
* Palace of Westminster and Portcullis House site, London;
* Sandringham House, Norfolk;
* Windsor Castle, Berkshire.
http://security.homeoffice.gov.uk/legislation/current-legislation/terrorism-act-2006/criminal-trespass-sitesQuite honestly, I wouldn't have expected to get into these sites without getting charged with something anyway. I can't see this as a significant diminution of my civil liberties.