I'd just like to thank all those who have explained a lot of the known unknowns (for me at least), be it camouflage schemes or radiator positions for in line engines. The aggressive looking radiator of the Typhoon was a really in your face aspect of an aircraft that could never be termed pretty and was in reality the beast that it appeared to be.
Was not the Sabre in reality two 12 cylinder engines with their twin crankshafts connected at the gearbox? Evidently it had a propensity to catch fire on startup if the priming was not just right (and "right" varied from engine to engine!), and as many fire extinguisher equipped ground crew as possible attended every start up. Thus you kept the canopy open and your straps undone until all 24 cylinders were firing in perfect harmony, ready to shut down and get out pronto if the ground crew indicated that might be a very good idea.
I also seem to remember that mass production of this state of the art power unit posed almost insuperable problems, in particular that of the sleeve valves. Bristol had both the technique and tooling to do so, and had to be ordered to release some of that capability to enable Napiers to ensure any production whatsoever. In the event it was the Bristol radials that reigned supreme, being the last in service UK military high powered piston engines before the ubiquitous jet turbines replaced them all.