What does it cost for the dentist to remove a wisdom tooth?

i am an nhs patient and paid 92 quid to have my wisdom tooth removed. i queried this as i didnt have the gum cut, nor did i have stitches. the dentist said it was a 'surgical' but my friend who is a dental nurse informed me that it isnt in this case. is 92 pounds the going rate? or am i being ripped off?!!