Dilligaff
If you are still looking for info on Smiths Lawn, I have some references/photos of it in use. PM me if you are interested.
BTW - the 'Flying Barn' has no connection with aviation. Its the name given to a farm barn originally constructed in the 18th Century which was portable - ie it could be towed from one point to another on the farm. There was one located here in the time of GeorgeIII, and the 'local' name has stuck.