It was part of a BBC show comparing the developement of British and german war equipment. I saw in on discovery,they compared the effectiveness of the spits 8 303' to the BF's 7.7 and 20 mm. They stated that the fight would have been a draw as both sides lost an A/C and that do to low fuel the last 109 had to RTB.
They also did a comparison between german and british arty as well as SE5 and fokker triplane,some interesting conclusions were made!!!