"OldMother - £25 is a bargain. That is how much I pay for a music lesson for DD and that is with us going to the teacher's house."
"We pay £18 for 30mun for our music teacher"
Thats works out at £36 per hour + costs of travelling to the teacher, in the hope of improving from A to A* in MUSIC.
That is not £25 per hour (twisting the facts), even if you actually pay £25 for 42 minutes.
Like twisting the facts by contradicting superficial tuition in Maths and English with superficial knowledge of "rock formations and what Jesus said and did".
"I kept an eye on DCs' progress in their music instruments and I sacked the teachers who weren't doing a good job."
So you didn't pay the sacked tutors?
The very fact that you had to sack tutors proves that they were charging an exorbitant rate (£36 per hour?) for being useless.
You still haven't provided a straight answer to a straight question:
So a wasted £36 per hour x say 20 hours = £720 if DC FAILS to go from an A to A*?