Recently I read an interesting article - can't remember where, possibly somewhere on the Web, that when the Grand Shaft was due to be renovated, the costs were estimated to run into many, many millions of pounds, but that later it was realised that the costs - pointing the walls etc., went only into a few hundred thousand pounds.
The author is a certain Paul Aka Scotchie
I think that the costs for the upkeep of ex-military structures on Western Heights are far less and lower than many may believe.
That's why I asked Paul from the start to give an estimate of the costs, but I never received a reply to this question.