Gaz, I get most of my timber from Scottish Hardwood (but NOT the pippy oak in my post elsewhere) and he always has some very good stock. It's like an Aladdin's Cave of hardwood.
The guys name is Paul, and as Andrew says he is near Bannf in a place called Gamrie, but can I suggest that you give him a ring (01261 851543) before you go, just to make sure he is there, because he's sometimes out on buying trips.
Have fun
Mike