SteveHants is right, the best deal is an occasional half a lamb, but on that amount of ground they'd be getting the better deal. £90 is ridiculous. I pay no rent at all for 80% of our (now) 66 acres and we still can't make the sheep pay, so if anyone is paying that kind of money a year, let alone a month, then its a massive and unecessary overhead. Keep looking and soemthing else will turn up, but rememeber you will have to move your sheep onto another plot to rest the land