I don't know of any plans as such - with EH things change all the time with the different management and also whether it be the Commercial side or the Conservation Side winning the arguement...
There was a lot of money spent on the Broadlees parking idea and that was dropped, current plan is (or was!) to convert the Officers' Mess to a combined visitor centre and hospitality suite.....
Also to get an idea of costs.... I think the Admiralty Lookout project was a 13 week/£0.25m project - I am sure it has been at least 2 years and the cost almost double that
