Blenheims continued to operate widely in many combat roles until about 1943, equipping RAF squadrons in the UK and at British bases in Aden, India, British Malaya, Singapore, and the Dutch East Indies.
Many Blenheims were lost to Japanese fighters during the Malayan Campaign and the battles for Singapore and Sumatra.
By that point, the traditional daylight light bomber role was more effectively carried out by suitable fighter-bombers, and the surviving examples were relegated to training duties.
Nonetheless, the Blenheim played a role in preventing India from falling and in recapturing Burma, destroying over 60 aircraft on the ground in raids on Bangkok early in the campaign.

One Blenheim pilot, Squadron Leader Arthur Scarf, was posthumously awarded the Victoria Cross for an attack on Singora, Thailand, on 9 December 1941.
Another bomber of No.
60 Squadron RAF was credited with shooting down Lt Col Tateo Katō's Nakajima Ki-43 fighter and badly damaging two others in a single engagement on 22 May 1942, over the Bay of Bengal.
Katō's death was a severe blow to the Imperial Japanese Army Air Force.

The Air Ministry's replacement for the Blenheim as a daylight bomber, another Bristol design, the Buckingham, was overtaken by events and changes in requirements, and considered inferior to the de Havilland Mosquito, and as such did not see combat.
The final ground-attack version – the Blenheim Mk V – first equipped 139 Squadron in June 1942.
 Eventually thirteen squadrons – mainly in the Middle East and Far East – received this variant but operated them generally only for a few months.
Blenheims continued to operate widely in many combat roles until about 1943, equipping RAF squadrons in the UK and at British bases in Aden, India, British Malaya, Singapore, and the Dutch East Indies. Many Blenheims were lost to Japanese fighters during the Malayan Campaign and the battles for Singapore and Sumatra. By that point, the traditional daylight light bomber role was more effectively carried out by suitable fighter-bombers, and the surviving examples were relegated to training duties. Nonetheless, the Blenheim played a role in preventing India from falling and in recapturing Burma, destroying over 60 aircraft on the ground in raids on Bangkok early in the campaign.
One Blenheim pilot, Squadron Leader Arthur Scarf, was posthumously awarded the Victoria Cross for an attack on Singora, Thailand, on 9 December 1941. Another bomber of No. 60 Squadron RAF was credited with shooting down Lt Col Tateo Katō's Nakajima Ki-43 fighter and badly damaging two others in a single engagement on 22 May 1942, over the Bay of Bengal. Katō's death was a severe blow to the Imperial Japanese Army Air Force.
The Air Ministry's replacement for the Blenheim as a daylight bomber, another Bristol design, the Buckingham, was overtaken by events and changes in requirements, and considered inferior to the de Havilland Mosquito, and as such did not see combat. The final ground-attack version – the Blenheim Mk V – first equipped 139 Squadron in June 1942.  Eventually thirteen squadrons – mainly in the Middle East and Far East – received this variant but operated them generally only for a few months.
Bristol Blenheim