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Only new things fitted have been timer/programmer and the overheat thermostat in the boiler but still the same. Interestingly, having read Keith's post I was prompted to try the room thermostat again and it DID shut down the system when I lowered it. Yesterday when I did it later in the evening...

Thanks Keith and I think you're in the right direction. But the system used to work fine and I'm puzzled as to why the room thermostat doesn't shut the system off when it gets to temp. It used to. So because it used to work OK I've assumed somethings busted, that's why I thought of thermostats...

Problem: whole system stays on until I turn down room thermostat until it clicks (i.e. it isn't up to temp yet). This switches the boiler off, but the system still stays on pumping for about 15 minutes until the boiler (?) has cooled down. Changed the programmer/timer and the overheat thermostat...