Zep
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Appreciate all your comments, some quite severe issues there, hopefully none of them.I will get the thermostat out and give it a check but one from Eurospares is £85 plus vat. It probably hasn't been changed in the life of the car so it will be 15 years old now. Has anyone used this waterless coolant I have seen advertised?.
I hope it works out.
I've looked into the waterless coolant for my car, but there are some pretty significant downsides from my point of view. It's pretty expensive for what it is and if you have a little leak you cannot top up with water, a problem if you are away from home. If you need to change a thermostat (again!) you would need to catch every drop for filtering and reuse.
The specific heat capacity is lower than water (unsurprisingly as only ammonia has a higher SHC and that would be quite unpleasant) so the engine will run a little hotter as the coolant carries heat away more slowly. Plus it is thicker than water / glycol so takes more energy to pump and the parasitic losses in the engine are higher reducing power.
But other than that it's great!