Further detailed information about accessing public information can be found on the following websites:-

Environmental Information Regulations 2004 - www.opsi.gov.uk/si/si2004/draft/20040331.htm
The full text of the regulations can be found here.

Department of Constitutional Affairs - www.foi.gov.uk
The full operation of the FOI Act including the exemptions that may apply to your request and some aspects of the EIR are explained on this site

DEFRA - www.defra.gov.uk 
For an explanation of the EIRs and their exceptions

Information Commissioner - www.informationcommissioner.gov.uk
Further information about the Data Protection Act, the Freedom of Information Act, and the Environmental Information Regulations from the body that regulates and enforces them