We had a schooling session there recently. The course and particularly the land needs work as it is rather neglected and poached. It is not big though - not what I saw of it anyway
I can't remember what it is in length but height varies from at a guesstimate, 2'3 - 3' ish. If you can imagine more of a hunter trial type of course. Good to hire though for general practise.
Ground is beside a river so is generally free draining. Sheep do graze on the land so you sometimes have to shoo them away from a jump before you jump it!
Just give them a ring, very friendly or send an e-mail. They normally give a quick response.