Well that's a tough one. I was thinking Blackburn 'Skua', a Boulton Paul or even a Fairy Battle, but i remembered the engine differences....so they're out.
Then the Vultee Vanguard came to mind, but when I dug up the only pic i have, I seemed to think it wasn't.
Could it be American and just in Brit skin as a trick, like maybe a Grumman Martlet..naa.
So my final conclusion is a Gloster F5/34? Did I win?
Bumba