More than 40,000 people across the Somerset, Wiltshire, Avon and Gloucestershire region (SWAG) have been seen and almost 450 lung cancers – which patients were unaware they had, – found, an NHS spokesperson said.

Dr Anne Bibby, clinical director of lung cancer screening for SWAG, said the CT scanner is like a chest x-ray “times 1,000” because the imaging is so in-depth.

“It’s not noisy, not claustrophobic and it’s over in five minutes,” she said.

“Being in Tesco’s [in St Oswald’s, Gloucester] and the golf course is about making it as accessible as possible.

“You can get on with your shopping, get on with your day – so it is not a big deal.”