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Where is the thermostat on a Glow Worm Space Saver boiler?

Hi,
I've just moved house and the water is boiling hot. I can't find the thermostat on the Glow Worm Space Saver boiler (I don't have the model number). I would like to turn it down as it's dangerous and is probably costing a fortune. Any ideas where I can find it?
Laura B, October 2008
Knob bottom left hand side

a, October 2008