Just as a big WI is the choice of the Me109 over the He112, how would the BOB have faired without the Spitfire eg if Mitchell had not gone for the elliptical wing etc, resulting in no performance improvement over the Hurricane & it not going into production?

According to this
http://www3.mistral.co.uk/k5083/main2.htm
the Hurricane won the BOB, could hold its own against a Me109 and had bags of development potential. But would it have been enough to take on the Fw190 in 1942?