"... had a Boulton Paul tail turret!"
Who ae you who is so wise in the way of the Boulton Paul turret?
Glad you pointed that out. I wondering why such a useless plane as the Defiant would be coming out at this point in time. Even in a BOB scenario it would be essentially useless (IMO) as there is are no forward firing guns and there aren't enough participants to have both a pilot and a gunner.
IMO you'd need both to use that plane as an offensive platform on line. Without coordinated maneuvering and gunning you have the pilot jumping between positions and that doesn't work well exept when attacking a base bineg vulched or defending oneself from enemy aircraft attack.