Research to expand our database of disused tunnels continues to pay dividends. Many thanks to those of you who have sent in contributions - they have all made a difference. If you can help with any details, omissions or corrections, please click the 'contact us' link in the sidebar to get in touch. All information will be gratefully received.

As well as the length and the opening/closure dates, we've tried to find links to photographs or information on each of the structures. Some form part of this Relics site but most go to external pages. Hover over the 'link' icon for details; click on it to pay the page a visit.

The 'Portal' links takes you to Streetmap, each one pointing to one of the tunnel's portals. If the precise location can't be identified, the area, town or city is given.