Sky looks hot, ground looks hot, even the sheep look hot. I wonder if there's any way to put a little more colour in the RH pic (sorry, the second pic - didn't notice the others the first time around) - sky in this one looks a little washed out. Is this the type of shot where a polarizing filter would have helped?
PS: Have just re-read my original post here and realised it might have read entirely as a criticism. What I meant was, it's not always easy to capture heat in a photo, but with the first two shots, which were all I was looking at at the time, I immediately felt the impact of the heat.