Thanks for the replies so far. I did query it with the receptionist who said this is how it works.
Actually this was my second visit to this dentist. The first inspection was more thorough, but she found a small filling to do which meant another appointment and moved me up to the next band. No pain whatever.
I also saw the hygienist, at £50. She was thorough but painful, and gave me a bit of a ticking off, as I am just not very good with interdental brushes, though I Clean my teeth three times on most days and have always had regular check ups. There are many people who do not clean their teeth that often, nor visit the dentist, so I rather resented this.
I am thinking of getting a new water plaque remover. . Are they any good? Not sure how they work.