I found this excellent website - some bloke up north setting up a Subterranea Scotia site
http://www.corestore.org/sub.htm
The highlights are the description & photo of South Sutor Gun Emplacements, nr Cromarty (about 20 miles north of Inverness)
http://www.corestore.org/guns.htm
And the picys of the North Sutor Gun Emplacements
http://www.corestore.org/NorthSutor.htm
Well worth a look - and probably worth a visit (if you're up that way anyway).