Thanks everyone, for such a warm welcome. Good to know that there are so many helpful people out there, even if some of you are far away. Isn't the internet great at overcoming the difficulties of distance?
The advice about horses and ponies bringing the grass down to the right height was really useful. There seem to be a lot of Shetland ponies grazing around here. Hopefully one of the owners would like to lend me a couple for or month or so until I can get the fencing/ hedges ready for sheep.