Comment received from MEB on 4th January 2010:
Purely from an explorers point of view, I believe (and I'm nudging 40 now!!) that if the tunnel is safe to both get to & walk thru, then it should be open to all, either legally or otherwise, such as Tidenham was until only recently. The longer ones (Woodhead, Rhondda &c) should be sealed but opened annually for guided tours if safe, such as Combe Down was. Personally, most portals that get sealed are broken open again anyway (Lydbrook, Moseley Green, Abernant, Cefn Glas, &c), so it seems pointless, & dedicated explorers will get in somehow anyway, but if all tunnels were as freely open as say Purton (Severn Bridge), then it would be a great world!!!
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