Thanks LS. I have contacted BAA regarding this and they are in the process of sending me information from their various Engineering departments.
Whilst this will cover most of the more technical or specialized areas of what I am after, I am still interested to know how current ATCO's find the tower in terms of comfort etc...
A very short summary for anyone working there is all that is needed and would be greatly appreciated. The reason I ask is that when working on such a project based on an inaccessible building/structure, at least getting information from those that do use the building shows a good attempt at utilising the best resources possible thus deeming my approach to the project to be intelligent!
SHT6Y