Hi R - she had the basic bloods done, and the vet said that if she was hyper-t, there would be an indication on her liver results, but they came back normal. Two vets have felt her throat and listened to her heart, and neither have recommended further testing for hyper-t. 2.64 is light, but she is a tiny cat. She does like the heat (this week she has discovered that she gets to sit in the path of the sun in the cat room and not the bathroom, so is currently in there for the second day in a row), and loves to sit in the sun, unlike Moses who sits in the shade. She has now taken to her comfort mat, despite not liking it initially!! She might have moved from the radiator as my bathroom is the warmest room in the house, so it might have just been too warm.