Landships II

A very large gun that was hidden in plain sight outside the Royal Artillery Museum (Firepower) at the Woolwich Arsenal has gone astray. I know it has been discussed in this forum previously, but that thread is also now in hiding.

I am looking for the 14" or 18" (people can't remember which it was. Or, is) gun on a railway mounting (some say, improvised railway mounting) that was on display outside the Royal Artillery Museum.

This thread (which includes a certain Mr. R. Langham) on the WWII Reenacting Forum says it used to be, "On a car park junctioning repository rd with green hill just off the common":
http://www.wwiireenacting.co.uk/forum/viewtopic.php?f=1&t=29871&start=0

(Google Maps shows it not, BTW)

This Army page says it has moved to Larkhill ("The famous railway gun... resides now next to the rugby pitch."):
http://www.army.mod.uk/23070.aspx

Has it moved, whatever it was (or is)? And is it on display to the Public, wherever it is?

Incidentally, whilst looking, I found this:
http://www.culture24.org.uk/history+%26+heritage/war+%26+conflict/art76320