and cannot readily ascertain, the person's name, or has reasonable grounds for doubting whether a name given by the person as his name is his "real name") As reason 1 but in respect of the person's address To prevent the person in question: Causing physical injury to themselves or any other person Suffering physical injury Causing loss of or damage to property Committing an offence against public decency (but only where members of the public going about their normal business cannot reasonably be expected to avoid the person in question) Causing an unlawful obstruction of the highway To protect a child or other vulnerable person from the person being arrested To allow the prompt and effective investigation of the offence or of the conduct of the person being arrested To prevent any prosecution for the offence from being hindered by the disappearance of the person being arrested Given the scope of the last two provisions, a new Code of Practice was issued for guidance. These changes were enacted on 1 January 2006. Protected Sites Sections 128-131 criminalise trespass at certain "Protected Sites", which consist of nuclear sites and additional sites designated by the Secretary of State. The latter consist of a range of royal, parliamentary, and government sites. Trespass is punishable on summary conviction with a fine and/or imprisonment for up to a year. Protests near Parliament In addition to the Protected Sites, the Act is controversial primarily for sections 132 to 138, which restrict the right to demonstrate within a "designated area" of up to one kilometre from any point in Parliament Square. Demonstrators must give written notice to the Commissioner of the Metropolitan Police six days in advance, or if this is not reasonably practicable then no less than 24 hours in advance. The area itself is defined by a Statutory Instrument, the Serious Organised Crime and Police Act 2005 (Designated Area) Order 2005, rather than the Act. It specifically excludes Trafalgar Square, a traditional site of protest on the northern boundary of the area. Apart from Parliament it also includes Whitehall, Downing Street, Westminster Abbey, the Middlesex Guildhall, New Scotland Yard, and the Home Office. It also covers a small section of land on the other bank of the River Thames, including County Hall, the Jubilee Gardens, St Thomas' Hospital and the London Eye. These provisions of the Act were introduced partially as a result of Brian