Capt. Moon’s preference for a beat reservoir rather than a true radiator surprises me, but he is, of course, entitled to his own tastes, and if he doesn’t mind a prolonged warming-up period and the possibility of ultimate boiling under adverse air-speed conditions, well and good. A lot depends on what the car is to be used for. It would probably be highly satisfactory under purely racing conditions, but in bank holiday traffic or on Bwlch-y-Groes . . . ?