It is a big design flaw twitchyarmadillo, but having been challenged with legal ramifications last year, they gave a public assurance to the bbc they would get all heating turned off ( as I said before it doesnt make sense to me as they must know each summer it will be too hot to have it on so why not just set a date each year and do it) This current heat wave was forecast and has lasted for a week, so why isnt it done? More to the point why not just do it anyway at the start of the summer? I have spoken with tfl before about this, they dont seem to care. I wonder if the best way is to pressure the bbc to investigate again ( you and yours radio 4)