there was a documentary on C4 a few months ago showing how dentists across britain were over charging, the NHS ones have a set standard rate and a lot of them try to make more by charging for scale and polish, youre right, this comes under band 2. The 1st time you go for a check up this is about £17, then for the filling you'll need to go back and pay £48 but the scale n polish should be included in that price. So many dentists are doing this and its wrong, you should complain