Well more efforts to rebalance the radiators (to balance the temperature drops across them*) seems to have brought the lounge (fan convector) up a little, though it still is a little low (and fluctuates more). One radiator in particular was seeing too much flow, and thus presumably hogging the hot water. There is no discernable effect on the overall return temperatures but the fan convector seems to run more often and produce more heating.
* by adjusting the 'lockshield' valves at the opposite ends from the thermostatic valves. This is fairly standard and I used thermometers to get 10-11C drops, though pros apparently do it by feel (if at all!).
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