[TowerTalk] Insulating Towers

[ADRIAN REES]

Hi
I have just received planning consent (in the UK) for 4 Towers, each with an effective height of 25 M. I plan on various Yagi's on each tower, and arrange them such that they form a square. 
 
As you can see I am going for a 4 Square. The question is how do I insulate the towers?
 
Each tower is  tilt over, telescopic. The towers are made by a company called Radio Structures of Nottingham (see http://www.radiostructures.co.uk <http://www.radiostructures.co.uk>  ) The towers are 25M Versions of there BM20.
 
The website shows how they are installed.
 
So far I think I need some sort of insulating bush around the studs that the bases bolt onto. 
 
Any ideas ?
 
Thanks
 
Adrian Rees (MW1LCR)