The Pemberton-Billing P.B.25 was a First World War British single-seat scout aircraft built by Pemberton-Billing Limited, later Supermarine Aviation Works Limited.The P.B.23 was designed in 1915 as a single-seat biplane scout. The fuselage nacelle was strut-mounted between the wings. The nacelle had an open cockpit for the pilot at the front and at the rear a 80 hp (60 kW) Le Rhone engine driving a pusher propeller. Twin fins and rudders were mounted on a wide-span tailplane, with an elevator attached, and all connected to the wings structure with four tailbooms, The P.B.23 failed to gain an order after it first flew in September 1915.