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OK thanks again, I'll give it a go.

Thanks. Is it likely they'd both fail at the same time or could that point to another problem somewhere? The little levers on both of them move freely, no spring action, no pressure needed to move them manually. They're wired into that Honeywell junction box - would this happen if the fuse in...

My CH controls don't have any effect on the system. With thermostat set to minimum and programmer control set to off, my boiler starts up every half hour or so. It seems to heat the water up to the temperature determined by the boilers own thermostat and then switch off till it feels it needs to...