This was brought to my attention last year by Jon Ratcliffe. I spoke about it briefly with Graham Lynch (BMC Access and Conservation officer), and he suggested that I investigate it further. I then got really ill with Chronic Fatigue and promptly forgot all about it.
Jon would be the best contact as he knows the new venues really well, and has been working on a topo. If you send me contact details for the warden, I'll pass them on to Jon.