These roads are maintained by the Highways Agency:
http://www.highways.gov.uk/aboutus/images/S080 275_TR_Net_map_(800ppi_wide)_for_WEB.gif
(If your browser automatically fits images to the window , you might need to click on that map to see it properly).
Problems with roads on that map can be emailed to:
[email protected]
Alternatively, phone this number:
08457 50 40 30
All other roads are maintained by the Highways Department of the relevant county council (or unitary/metropolitan authority, as appropriate).
Chris