Going by the photos I have of the Mk.I, the "A" would be in front of the roundel on both sides.
Also, you have some white on the port gun barrel shrouds. I'm not sure what's up with that.
As mentioned the roundels
Oh, and your blue/white/red stripes under the cockpit seem a bit long and too far aft. They are crossing the panel line and they should be in front of it
I think the ribs on your ailerons are quite pronounced, and either way, the elevators/rudder/ailerons should all look similar becase they were all fabric-covered. I'd suggest either making the rudder/elevators look like the ailerons, or vice versa, but not mixed.
EDIT: Oh, and you've got white rings around the gear. This was on the hurr1 template as well. You'll need to remove those.