Last year you and yours on radio 4 investigated why some of Londons buses had the heating on during a heatwave. It was established that on many buses the heating can only be turned off by an engineer, that they have a legal obligation to do this at certain temperatrures and that it would take a week to manage this. This article made no sense to me as presumably the bus companies know that they will need to turn the heating off in the summer ( not because you and yours are making a fuss). Today and on other days this week the p4 had the heating on , as do other buses. If you think it is not acceptable to be sitting on a bus significantly hotter than the outside temperature, because it is full to bursting with passengers generating body heat but more importantly it has a pipe running down the inside discourging heat please contact tfl or radio 4 you and yours asking them to investigate again. There are articles on the news every summer about temperatures on the underground ( which may require a lot of money to fix) but the problem of heating switched on on buses ( which does not) seems to be overlooked.