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@Gordon
That's a shame. I'm afraid it looks like a hardware issue. I haven't seen any watches with it here, but someone else on the forum did report an issue a few months ago with theirs after it got some water inside it.
I think what's happened is somehow moisture gets into where the HRM sensor is, and then you end up with corrosion around the LED contacts - it still works but the LED then requires more power to make it light, and that means the HRM gets hot and wastes battery. I imagine with the HRM off you'll probably get reasonable battery life though?
I'd be interested in whether you can see any corrosion/water signs through the HRM window on the back of your watch?
It might be possible to remove the HRM window (it seems to be held on with some kind of silicone), clean up the back of the PCB with some isopropyl alcohol and then re-attach the window, although I did try here just now on a dead Bangle and it would likely to be a bit tricky to do without chipping the edge of the plastic window slightly.