hello magpie, its still there, has a gate on it at present but has a bar removed leaving just enough room to squeeze through.
I have a picture somewhere of the entrance, will try and get it uploaded.
theres also another level related to a crosscut of this vein just upstream.
Could meet up and show you some-day? I live at shotley so easy for me to get to.
Damned if you do, and damned if you don''''''''t.