The air circulation systems in place were under extreme pressure with the unseasonably hot weather at that time. That coupled with a large concentration of people inside the building resulted in very uncomfortable temperatures for customers to study in.
I can only apologise for this discomfort. English weather is challenging at the best of times and when the pressure of dissertations and revision are the focus of your time it doesn't help to have any kind of distractions. The systems we have have to cope with large areas which make them slow to respond to changes in temperature. By the time the air circulation responded to initial rise in external temperatures a lot of heat had already built up and been trapped in the building.
Air conditioning may seems like a simple (if an extremely expensive solution) but it would not be in keeping with the University's budget or energy efficiency strategy so is not a possibility at this time.
Thanks