On 20 Sep, 02:17, "John Rowland"
wrote:
The interweb says that there are four shafts, but I can only see three. Does
anyone know if shaft 4 (the northernmost one) is still there?

The general opinion amonst the fanshafting mafia is that Shaft 4
disappeared in its original form fairly recently. However, it is
possible there is still some form of opening, but cleverly concealed
at surface level. It's very visible down below, however.

BRB Class 465.