In 1936, the Finnish Air Force became the first export customer for the Blenheim, ordering 18 Blenheim Mk Is, which were delivered from Britain between June 1937 and July 1938.
Two years later, Finland obtained a manufacturing licence for the Blenheim.
Before any aircraft could be manufactured at the Valtion lentokonetehdas (State Aeroplane Factory) in Finland, the Winter War broke out, forcing the Finns to order more aircraft from the UK.
A further 24 British-manufactured Blenheims were ordered during the Winter War and were delivered from the RAF's own stocks.

In the aftermath of the Winter War, 55 Blenheims were constructed in Finland, the final aircraft being completed in September 1944; this brought the total number of Blenheims in Finnish service to 97 (75 Mk Is and 22 Mk IVs).
The Finns also received 20 half-completed ex-Yugoslavian Mk IV Blenheims captured by Germany, together with manufacturing tools, production equipment, and a huge variety of spare parts, although some of these had been damaged or otherwise destroyed through sabotage.
Yugoslavia had ceased production of the Mk I and commenced a production run of Mk IVs just prior to the April 1941 invasion.
The British-made Blenheims had RAF green interiors, RAF seat belts and instruments on imperial units, while Finnish-made Blenheims had medium grey interiors, Finnish-style seat belts and metric instruments.

The Finnish Blenheims flew 423 missions during the Winter War, and close to 3,000 missions during the Continuation War and Lapland War.
Blenheim machine-gunners also shot down eight Soviet aircraft.
Thirty-seven Blenheims were lost in combat during the wars.

The Finnish Blenheims were divided on six series (sarja):
Series I (BL-104..BL-121): 18 British-made Blenheim I bombers with doorless bomb bays.
Arrived in 1938
Series II (BL-146..BL-160): 15 Finnish-made Blenheim I bombers with deepened bomb bay doors.
In service by 1941.

Series III (BL-122..BL-133): 12 British-made Blenheim IV bombers ("long-noses").
Arrived in January 1940.

Series IV (BL-134..BL-145): 12 British-made Blenheim I bombers.
Arrived in February 1940.

Series V (BL-161..BL-190): 30 Finnish-made Blenheim I bombers.
In service by 1943.

Series VI (BL-196..BL-205): 10 Finnish-made Blenheim IV bombers.
In service by 1944.

Seventh series, VII (BL-191..BL-195), six Finnish-made Blenheim I bombers, was cancelled in 1944.

Series I with doorless bomb bays could carry 800 kg bomb load in the bomb bay and up to 100 kg on wing cells.
Series II, V and VI could carry 800 kg load on bomb bay and 172 kg on wing cells and fuselage racks.
Series III and IV had the original RAF bomb bays and racks and could carry only 454 kg (1000 lb) load on bomb bay and 72 kg (200 lb) on wing cells.
The bomb bays, bomb bay doors and bomb racks of various series were modified on major overhauls to host bigger bombs.,

After the war, Finland was prohibited from flying bomber aircraft by the Paris Peace Treaty, with Finland's Blenheims being placed into storage in 1948.
However, in 1951, five Blenheims were re-activated for use as target tugs, with the last flight of a Finnish Blenheim taking place on 20 May 1958.

The usual nickname of Blenheim in the Finnish Air Force was Pelti-Heikki ("Tin Henry").
In 1936, the Finnish Air Force became the first export customer for the Blenheim, ordering 18 Blenheim Mk Is, which were delivered from Britain between June 1937 and July 1938. Two years later, Finland obtained a manufacturing licence for the Blenheim. Before any aircraft could be manufactured at the Valtion lentokonetehdas (State Aeroplane Factory) in Finland, the Winter War broke out, forcing the Finns to order more aircraft from the UK. A further 24 British-manufactured Blenheims were ordered during the Winter War and were delivered from the RAF's own stocks.
In the aftermath of the Winter War, 55 Blenheims were constructed in Finland, the final aircraft being completed in September 1944; this brought the total number of Blenheims in Finnish service to 97 (75 Mk Is and 22 Mk IVs). The Finns also received 20 half-completed ex-Yugoslavian Mk IV Blenheims captured by Germany, together with manufacturing tools, production equipment, and a huge variety of spare parts, although some of these had been damaged or otherwise destroyed through sabotage. Yugoslavia had ceased production of the Mk I and commenced a production run of Mk IVs just prior to the April 1941 invasion. The British-made Blenheims had RAF green interiors, RAF seat belts and instruments on imperial units, while Finnish-made Blenheims had medium grey interiors, Finnish-style seat belts and metric instruments.
The Finnish Blenheims flew 423 missions during the Winter War, and close to 3,000 missions during the Continuation War and Lapland War. Blenheim machine-gunners also shot down eight Soviet aircraft. Thirty-seven Blenheims were lost in combat during the wars.
The Finnish Blenheims were divided on six series (sarja):
Series I (BL-104..BL-121): 18 British-made Blenheim I bombers with doorless bomb bays. Arrived in 1938
Series II (BL-146..BL-160): 15 Finnish-made Blenheim I bombers with deepened bomb bay doors. In service by 1941.
Series III (BL-122..BL-133): 12 British-made Blenheim IV bombers ("long-noses"). Arrived in January 1940.
Series IV (BL-134..BL-145): 12 British-made Blenheim I bombers. Arrived in February 1940.
Series V (BL-161..BL-190): 30 Finnish-made Blenheim I bombers. In service by 1943.
Series VI (BL-196..BL-205): 10 Finnish-made Blenheim IV bombers. In service by 1944.
Seventh series, VII (BL-191..BL-195), six Finnish-made Blenheim I bombers, was cancelled in 1944.
Series I with doorless bomb bays could carry 800 kg bomb load in the bomb bay and up to 100 kg on wing cells. Series II, V and VI could carry 800 kg load on bomb bay and 172 kg on wing cells and fuselage racks. Series III and IV had the original RAF bomb bays and racks and could carry only 454 kg (1000 lb) load on bomb bay and 72 kg (200 lb) on wing cells. The bomb bays, bomb bay doors and bomb racks of various series were modified on major overhauls to host bigger bombs.,
After the war, Finland was prohibited from flying bomber aircraft by the Paris Peace Treaty, with Finland's Blenheims being placed into storage in 1948. However, in 1951, five Blenheims were re-activated for use as target tugs, with the last flight of a Finnish Blenheim taking place on 20 May 1958.
The usual nickname of Blenheim in the Finnish Air Force was Pelti-Heikki ("Tin Henry").
Bristol Blenheim