Boulton Paul Defiant Mk.1
As the least effective of the RAFs interceptor fighters at the start of the Battle of Britain, it is interesting to note that the Boulton Paul Defiant actually entered service much later than either the Spitfire or Hurricane, but was quickly relegated to nightfighter operations when it became obvious the extra weight of the power operated turret made the aircraft a relatively easy target for Luftwaffe fighters.
