Son is at private school, was offered music lessons starting 2 years ago (September 2008). Didn't ask about costs - turned out to be £17 for half an hour lesson (the teacher comes in at 8am and takes students every half an hour for the whole day), which was more than I was expecting... We signed a contract with the teacher that didn't make any mention of fees or increasing them, only that there was a late payment charge if they weren't paid on time.
Last September the invoice was for £17.50/lesson. Was a bit aggrieved that the fees had been increased with no notification or discussion, didn't say anything to the teacher, as the increase itself wasn't outrageous. I did ask the school why the fees were so high, and they told us that they don't have any control over the fees and don't charge the teacher for use of the room.
This September we were sent an invoice for £18.50/lesson, an increase of double last year, and again no notification or discussion. I wasn't happy at paying 6% more at a time of wage freezes, and just called the teacher. Teacher said 'I charge more in other schools, fees are reasonable, the other instrument teachers charge a similar amount, and I can't make an exception for you, if you don't like it, you can go elsewhere.' [The issue here is that if you don't get lessons from him, my son would have no involvement with school concerts, etc.]
AIBU?