They were spitfires MK V's. You can tell by the muzzles on the inner's of the wings. And the .303 cal slots on the outside of the wings. If it was not a MK V (5), you would have 2 or more guns on the inner part of the wing, on this case, theres only 1 on each wing meaning its a 20 MM belonging to a Spit 5.
And by the way, the flying scenes were ALL animation! None of those planes ever flew, all animation!