You know Knocker...I think Youv'e got it. If I'm right , this is the section (inside the tunnel) that collapsed beneath the old C&R railway which warranted the digging of the new bypass.
I thought the ground seemed somewhat familiar, Lived in that area for many years and know the Carnon Valley well, especially that bit. I am still in contact with the guy that owns the land over which the river flows and the County Adit empties onto. I'll email the pic to him and see if he agrees.
Sorry geoff, I don't know how I lost that thread. Good show the other night by the way. Will talk soon about other things.
"You Chinese think of everything!"
"But I''m not Chinese!"
"Then you must have forgotten something!"