And by the start of the Battle of Britain most realised the days of 8 x .303's were already over, and cannon's were the future, but the Hispano Mk.1 was just not suitable for wing mounting in fighters with the 60 rd drum mag feed, and thus the Beaufighter was the only real use of it at the time, as the RO could change the drum mags on the floor mounted cannon's from racking in the fuselage.
It wasn't until Martin Baker created a successful belt fed system for them by early '41 that they worked for wing mounted, single engine, single seat fighter applications.