Suddenly thought I ought to visit the forum after a year or two

and ask you guys.
We've been approached by a known farmer who farms a few miles away whether we would 'rent' out our ground for overwintering approx 100 sheep

.
We have fifteen acres and adjoining neighbours can add two small fields to make 22 acres in total. I have been appointed 'spokesman'.
I walk round every morning with the dog so can do lookering and he says he will be up every day too. We have two water troughs and can leave a gate open in the field that has no water.
These are nice fields we take hay off. Can anyone help by enlightening me how much we could ask for the rent without offence but making it worth our while. I used to have a shepherd, now retired, who put 30 ewes on our 15 acres and he used to pitch up in the spring with a couple of lambs for the freezer.
What do you think?