OBP, surely you've heard of the police reform act?
http://www.opsi.gov.uk/acts/acts2002/20020030.htmSection 50 Persons acting in an anti-social manner (1) If a constable in uniform has reason to believe that a person has been acting, or is acting, in an anti-social manner (within the meaning of section 1 of the Crime and Disorder Act 1998 (c. 37) (anti-social behaviour orders)), he may require that person to give his name and address to the constable.
(2) Any person who-
(a) fails to give his name and address when required to do so under subsection (1), or
(

gives a false or inaccurate name or address in response to a requirement under that subsection,
is guilty of an offence and shall be liable, on summary conviction, to a fine not exceeding level 3 on the standard scale.
Only several away from Section 59!!