Also one other thing I've recently been trying to understand relating to the bypass point, I got told by one person that I should have an automatic bypass installed if I'm getting the evohome but (and I guess this might be why they suggested it) I didn't mention that although I was asking about 8 TRVs (so two packs) I actually have 9 radiators and 2 towel rails. So the additional radiator which is a small one in the hallway and the towel rails will not be controlled. I get the impression that as a result, the need for a bypass is negated/reduced because even if the boiler was asked to fire up when all TRVs are closed (I understand the evohome does have a tendency to do this) there will be somewhere for the heat/hot water to go. If later I decide to control the towel rails and last radiator then I'd need to get a bypass installed. Is that all correct?