I think the £150k will be gross cost to the NHS rather than an estimate of what they would charge an individual. Most of these new technologies are on HP so a proportion of the cost of the machine, staffing an RT suite, running the appointment system, cleaners, drinking water, paper towel for the beds, the computer programming, lab technicians - I bet it mounts up frighteningly quickly.
Dad paid £18,000 cash for RP 13 years ago. I will look at our invoices tomorrow to see what we paid for John's RP & RT.