Yes, lovesbach you are missing something, the private patient that returns to the NHS with a battery of tests goes on the waiting list according to clinical need, just like any other NHS patient. The delay in NHS patients getting prompt tests frequently results in them needing more treatment which is more expensive and more time consuming whereas many private patients come off lists completely because they don't need treatment or need more minor treatment and get it done privately. In an Ideal world we'd all get treated quickly and efficiently but we don't live in that Ideal world.
My skin cancer would have probably needed a skin graft if I'd waited to have it done by NHS (9 months wait) and it would have been done by excision which is quicker and cheaper but runs the risk of it returning. Done privately I had it done in a week by Mohs, ie examinined by lab to ensure I was cancer free and didn't need a skin graft. I paid £3,045, £2,000 to consultant and 2 other staff, £1,045 to the NHS for the use of the facilities which were used in the evening outside normal NHS clinic and treatment time. I paid privately to wear a holter monitor for a week to get an accurate diagnosis of the arrhythmia that proved difficult to diagnose as it was intermittent. This meant I was able to get the treatment I needed ( after a very long wait) and come off a waiting list. I don't think anyone should be made to feel guilty about spending their own money on medical tests and treatment, I certainly don't think I have adversely affected any NHS patients, quite like opposite.