Information received,
1. There were two variants of the bulbous Spitfire spinner. Both were CSA designs/manufacture and not Rotol.
2. Manufacturer designation code which reflected design and construction methods-CSA= ES/#, Rotol =CM/#.
3. There are no probably surviving examples (a prop hub for the magnesium blade salvaged from a crash site has been measured).
4. The first variant, ES4, was for the magnesium blade.
5. The second variant, ES5, was for the wood blades which were first seen on some of the early Castle Bromwich Mk II's. Photographs suggest use up to and including the Mk V.
6. There were differences in the base plate layout and possibly the blade fillets and blade cut-outs in the spinner shell.
7. The pointed 'fighter' spinner (as Rotol termed it) was designed in early/mid 1940 but did not come into production until late 1940. Photographs suggest that this design was first fitted to the Hurricane (Mk I and II -CM1/ES/9) with a much later appearance on the Spitfire(ES11).
8. The spinner base diameter for the ES5 was identical to that of the later ES11. The unit was about 5 inches shorter.
P.S. The legend of the bulbous Spitfire spinners being used on the Hurricane during 1939/40 is probably incorrect.