The test, called EarlyCDT-Lung, will include 10,000 high-risk smokers (defined as having smoked the equivalent of 20 cigarettes per day for over 20 years).
It detects signals produced by the immune system when lung cancer is present.
This can mean up to five years earlier than tumour detection.
More top news
After a largely fine and sunny start to the day a bank of cloud and rain is currently making its way southeastwards across Britain.
A woman gave birth to a baby boy on the hard shoulder of the M42 after getting stuck in traffic.
Dianne Abbott said the suggestion Labour had a 'problem' with anti-semitism was a 'smear'.