The Electrical Safety Council (ESC) produces, in association with other industry bodies, a range of Best Practice Guides, in PDF format, which provide definitive information and guidance on a range of technical subjects. This one is about electrical installation condition reporting:
The Electrical Safety Council's 'Best Practice Guide No. 4 (Issue 3)' concerns electrical installation condition reporting (EICR), and the classification Codes for domestic and similar electrical installations.
To download it for free, please click on the link below (PDF format – 1.83 MB file size).
Other 'Best Practice Guides' available cover topics ranging from test instruments for electrical installations and guidance on safety isolation procedures to connecting a microgeneration system to a domestic or similar electrical installation.