Section 87 of the Environmental Protection Act 1990 says
�(1) If any person throws down, drops or otherwise deposits in, into or from any place to which this section applies, and leaves, any thing whatsoever in such circumstances as to cause, or contribute to, or tend to lead to, the defacement by litter of any place to which this section applies, he shall, subject to subsection (2) below, be guilty of an offence.�
The Clean Neighbourhoods and Environment Act 2005 amended the Environmental Protection Act 1990 and added this to it
"(8A) If an authorised officer of a litter authority proposes to give a person a notice under this section, the officer may require the person to give him his name and address.
(8B) A person commits an offence if-
(a) he fails to give his name and address when required to do so under subsection (8A) above, or
(b) he gives a false or inaccurate name or address in response to a requirement under that subsection.
(8C) A person guilty of an offence under subsection (8B) above is liable on summary conviction to a fine not exceeding level 3 on the standard scale."
(A level 3 fine is �1000 by the way)