Noodley said:And there was you asking for help from people outwith Scotland..
There is a flagstone quarry near Watten, Caithness who might be able to help, and there is also the Flagstone Centre in Castletown which is where that pic was taken.
I've bought the slate as I wanted the Broughton stuff. It's almost a green blue colour with purple through it. It's stunning looking when done right.