I posted this link on the Southrn Water Emegency control bunker - Jan 2008 post. on the site it says that "Southern Water and South West Water built three each, whereas Thames Water went for eight and Severn Trent were the undeniable winner, coming out of the cold war with a total of 12 useless bunkers they’d never use." the link is http://www.bbc.co.uk/insideout/content/articles/2009/01/21/south_s15_w2_bunker_video_feature.shtml hope its some interest to someone.