Indymedia have details of Yet Another Arrest of Brian Haw, the long term peace protestor in Parliament Square,
This time there seems to have been some woman attacking his banners and signs at 5 am in the morning.
Mysteriously Brian Haw got arrested, and some of his display seized as "evidence", despite the fact the the woman attacker was released after being cautioned.
It also appears that the police threatened people trying to take photos with arrest, although there is absolutely no law which forbids such photography.
There is also an eyewitness account by a public relations manager who saw guntoting policemen making a political decision about the slogan on a T-shirt, in the entrance foyer of Portcullis House.
Neither of these case involve the Seious Organised Crime and Police Act 2005 Designated Area per se (although they are both areas specifically coverd by the Designated Area) , but older Public Order legislation, but they do seem show how stupid it is to let individual Policemen make such arbitrary decisions.
There needs to be a member of the public who makes an official complaint to the police about the public display of something which might cause distress or offence. It is not for individual Police Constables to do this off their own bat.