AircraftBlenheim Mk I, Mk IFBlenheim Mk I, Mk IFBlenheim Mk I, Mk IFFamilyBristol BlenheimClassLight bomberChangesShort-nosed airframe with Mercury VIII engines.Produced1,552Service193119321933193419351936193719381939194019411942194319441945Finland · Scandinavia≈ Dec 1939 – 13 Mar 1940Yugoslavia · Balkans≈ 6 Apr 1941 – 17 Apr 1941Finland · Scandinavia≈ 25 Jun 1941 – 27 Apr 1945United Kingdom · Western Europe2 Jul 1940 – 3 Jul 1940Modifications 2193119321933193419351936193719381939194019411942194319441945Blenheim Mk I1,552≈ Dec 1939 – 13 Mar 1940≈ 6 Apr 1941 – 17 Apr 1941≈ 25 Jun 1941 – 27 Apr 1945Blenheim Mk IF2 Jul 1940 – 3 Jul 1940