i believe Uk law states that if in office temperature exceeds (something like) 26.9 you dont have to work there unless they get the air con or some means of reducing it,
i could be mistaken though!
"There is a legal minimum indoor temperature: 13oC (55oF) for those doing strenuous work, 16oC (61oF) for those behind a desk. But there is no equivalent if it gets too hot – which is farcical and dangerous, according to the Trades Union Congress"
http://www.out-law.com/page-5910
hmmm,
at the moment im sat here behind my desk in my office in 3/4 shorts and a white shirt quite open..
im at an ideal temperature at the moment..
luckily the dress code isnt strict here and because im 3rd/4th line we have no interaction with customers/customer services..
being a network geek pays off sometimes!