Salute
Two position props were not in general use during the BoB as I have proven in a previous post.
http://forum.1cpublishing.eu/showthread.php?t=21066
All Spitfires I's were converted to Constant speed props starting in late June of 1940, conversions were a matter of a few weeks.
The only relevance for two position props is for scenarios set before the BoB, ie. Dunkirk, interceptions of early recon flights over Britain, etc.