We're paying £200 an acre a year for 6 acres in Aberdeenshire because our landlady doubled the price between us signing the house lease and us getting the use of the field.
we signed on the understanding that she'd sow this part of the field and rent a few acres for £100 per acre per year.
having asked around, the £100 per acre per year is steep, but at the price you're paying, it doesn't sound too bad.