In December 2018, as defence minister, I inadvertently misled parliament. Asked whether blood samples had been taken from service personnel for radiological monitoring during the nuclear bomb tests, I relayed the line provided to me by the Ministry of Defence: it was “unable to locate any information” suggesting blood samples had been taken for radiological monitoring at the tests.

I now know the reality was very different – these samples were taken across the armed services branches. But those veterans seeking compensation for serious illnesses developed after radiation exposure have been unable to access them. This is among the greatest scandals in Britain, and it must be addressed.

More than 20,000 armed forces personnel took part in dozens of nuclear tests and nearly 600 radiation experiments, the majority between 1952 and 1967. This was for the entirety of the cold war. The science was deemed necessary. How effective were our own bombs and, just as importantly, how well could our military function if the Soviet Union used theirs against us? Test after test was conducted in the Australian desert, at Christmas Island in the Pacific, and we also sent service personnel into the atomic clouds of allies and enemies. Yet their medical records for the period are missing.

Other nuclear nations, such as the US, France and the........

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