Last year I paid £80 per acre (seasonal grazing - beginning April - end Sept) BUT it was also written in to the agreement I had to top all the fields, spray then and weeds were my responsibility - which is very costly.
Land owner was an utter pain in the a*se, half way through the year he started telling me I couldn't have livestock in certain fields and then accused me of sub letting fields, it ended up turning in to a bit of a legal battle towards the end which cost me an extra £500 for solicitors fees.
Be very careful who you rent land from - even if you think you have things clear at the start land owners can change their minds and make life difficult.
In my experience taking grass lets through an auction mart is far easier and stress free than dealing with the owner of the land.