What's Your Mark of Success?

When should a test like this be allowed across the whole of the enne chest? When we're looking to see whether there is a screening intervention, so something that's offered to people who don't have symptoms. We would look to see whether the national screening committee has made a recommendation for that test to be introduced or not. The last thing we want to do is not to use something that might work. But we need to be really careful that we get high quality, independently scrutinized evidence to mixture. Wee piting our investment in the right way.