All early Spitfires, includind Spitfire Vb, received engine cut-out during negative-g maneuvers, similar to Hurricane Mk. I, but they have an makeshift solution to this at 1941 -- Miss Tilly Orifice --
http://en.wikipedia.org/wiki/Tilly_orifice
"While not solving the problem fully, the restrictor, along with modifications to the needle valve, permitted pilots to perform quick negative g manoeuvres without loss of engine power, removing the annoying drawback the British fighters had had in comparison to the German Messerschmitt Bf 109 machine, which was equipped with fuel injection. Miss Shilling with a small team travelled around the countryside in early 1941 fitting the restrictors, giving priority to front-line units."