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Thermocouple? Yes that sounds about right. It's a bullet-shaped probe that pushes into the pilot-light housing and the other end has a gland nut where it enters the gas-valve(?) housing. I'll be relieved if it's a universal design. We're due to replace the whole boiler system - but not just yet...

The sensor that is heated by the pilot light has broken. Where can I find a replacement? This is a copper (?) tube that connects between the pilot light jet housing and the ignition 'box'.