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Thanks. I'll try surveying the temperatures. If that fails to show where the restriction is, power flushing at each radiator inlet and outlet could do so, but I'd probably make a mess. Any other ideas? These are all helpful.

How would I tell whether the spreader has given way or there is a restriction in the pipework, heatingman? Temperatures have been measured with a thermometer on the outside of the boiler only. The temperature there is about 80 degrees when the boiler cuts out (as expected) but continues to rise...

Sorry, bellairaphon, I don't understand what you're suggesting. The boiler is an Ideal Standard E Type RS.

I don't think it happens on HW as well as CH. However, that's a little difficult to test, as when I've tried it the HW has already been quite hot and and the circuit to/through it is short, so I wouldn't have expected the heating to stay on for long. (I'm not at the house for a ccoulpe of days...

I'd be very grateful for help with the following. Problem The boiler cuts out 5 minutes after starting because it reaches 80 degrees. It then takes 10 minutes to cool down enough to restart, though it can sometimes be restarted by flicking the HW on and off or clicking the room thermostat...

Thanks. Sounds like I ought to get someone fairly skillful, as the hole is less than 10 mm from the wood at one side. I don't think I trust myself to do it.

I have an almost horizontaL lead gutter about 70 mm wide between a gently sloping zinc roof and a vertical brick wall. There is a hole in the lead, about 15 mm by 5mm, probably caused when I was cutting away the wood underneath the flat roof, which is rotting. (The water causing the rot is...