Is private dentistry really this cheap?

I went to a dentist recently in the UK. I had a rapidly growing infection on the weekend so I went to the dental hospital and walked out with a few boxes of antibiotics minus about 6 quid. The following week I registered with a dentist in Glasgow, paid �20 up front, had a check-up, a few X-rays, and then came back the next week to get 2 cavities filled (the infection went down before necessitating root c). The total came to �60, and they returned the �20 deposit. And all of this was not on the NHS dime, so I wonder if that is a normal price, because it seems very cheap to me (I'm used to paying at least $100 per filling, $30 per X-ray, in the US).