NHS is focused on the appropriate allocation of resources to the problem. It strikes an excellent balance of doing the right work when necessary and based on probabilities. If you have evidence that the process recommended by the nhs is failing patients in statistically significant numbers I would agree with you on them not doing enough tests but frankly, I think NHS would perform very well if it was adequately resourced (it’s currently starved of necessary funding).

The NHS follows a strict set of guidelines for the identification and treatment of illnesses. They do not act like medical businesses such as hospitals whose goal is to do as much testing as they can justify to get more money from insurers.