Sadly, that's all that's known, as it was just a rough concept that wasn't proceeded with, as PR Spitfires and later Mosquitoes did the job quite well, and for long range fighters (though that took a bit longer) we ended up with the Merlin Mustangs.
But I did post this thread mostly for speculative reasons. Namely, a "what would you do?" with the concept and/or how you'd evolve it. Sort of like say you're running a country that's allied with the Allies in World War II but want to limit reliance on purchasing foreign weapons system (ie, you want to be self reliant).