i paid £60 a week for my horse to be broken, he was not wild and id done alot of work with him so he was away for 5 weeks and walks, trots, canters, jumps and hacks out alone
If I send one away on full livery to be broken I would expect to pay a minimum of £140/week. Agree with KatB if you are not providing the livery then charge per hour.
My 3 years old has just come back from 2 weeks of handling training. I was charges £160 per week and he recons that to back / start her she would have needed to be there 6 weeks. This included all feed bedding etct etc.
I paid £100 p/w for William a couple of years ago in Devon. Shoeing and wormer on top. He was there for 7 or 8 weeks. Would expect to pay more round this way.