I respect to AK`s comment on service abuse I do feel there are some questionable practises.
Some years I attended Pembury Hospital for serious spinal treatment. It was decided I needed a MRS scan. Bearing in mind the discomfort and pain was often chronic my consultant said I could go on a list that may take weeks but If I paid £500, which I did, I could be done in three days, outside normal hospital daily times, NHS equipment and NHS staff!!