I flew in CW from BOS to LHR on a 777 couple of days ago and I agree that the cabin was hot. While it was far from a sauna (less than +60C is not even considered to be a proper temperature, only temps closer to 80-100C will give you street cred even among Finns), it was unpleasant. Combine that with the usually dry cabin air and a cold, and I've been blowing gross bloody snot for the past two days.

While it didn't make my sleeping that much harder, I didn't need the blanket and I was already wearing just a T-shirt!

I was chosen to receive and fill out a customer feedback form and decided to mention about the hot cabin temperature. It really was my only complaint, otherwise BA got high points from me.