Thanks Uno.
Something weird is going on with my Incukit, my combo proportional thermostat/heater. The blasted thing is shutting itself off somehow. First time it happened I thought I'd pulled the power cord out by mistake, the second time I know it did it itself..... Another batch of test eggs wasted..... I need to get my incubator going for some red dorking, dark cornish and buckeye eggs for the week of the 25th. I'll probably just order one of those STC 1000, sounds like a reliable thermostat and wire up a couple of light bulbs (in case one burns out! ) rather than risk having the same thing keep happening with the Incubator Warehouse incukit. Not impressed.