Hi Steve,
For info, yes, the tank is in the "standard" marlin position on the main bulkhead top tube and as high as it could be without fouling the body. It is certainly the highest point in the system.
Where in the system did you wonder about the non-return valve? I've been wondering if one of the central heating type "auto-bleed" valves on top of the radiator might do the trick, but then I also need a way of getting air back in to the expansion bottle...
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