"Bristol" Blenheim Bomber. "Bristol" Type 142M Two "Bristol 840 h.p. Mercury engines. The first all-metal modern twin-engined monoplane for the R.A.F. to carry the whole of the military load within the structure. Saw service with all the Commands of the R.A.F. and in all theatres of war. Made the first air raid of the war over Keil, in September, 1939. Manufactured in thousands by the 'Shadow' industry as well as at Bristol.