A filling on the NHS should cost no more than £46.40 for everything, from start to finish.
If they just took some X-Rays and a simple inspection today you are not required to pay any more than £16.50 for the checkup and the remaining amount is due on completion of the filling.
It is always a good idea to get a complete receipt for what you have paid for, I know too many people who have had to dispute their bills from dentists after being charged twice.
And yes, they are all disgusting cretins and should burn
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