Yes Ken, there was some discussion batting backwards and forwards about "what to do" with these connections when I was wondering what to do. In the end I cheated a little in that the point where the temperature sensor is installed reduces the bore diameter down to about 10mm. This allows water to flow through the circuit clearing air out of the coolant and the cylinder head in question but without directing too much water away from the primary cooling circuit. It also provided the perfect location to put the header tank at the highest point (but at the cost of moving the battery to the front of of the engine bay).
Well, that's my thought on how it ought to work. Seems to be OK so far.
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