That's more than we get here. We get a sawn edge, so that even the stone with a natural surface, when installed, looks like floor tile at the joints, unless many hours are spent beforehand "fettling" the edges with a pitching chisel or mallet.
I'm in the US and have a question about British "riven" patio stone, what we call "natural cleft" stone. When you go to a stone-yard to buy it, was it sawn by the quarry so that it has a perfectly straight edge, leaving the customer to fabricate a natural edge?
I'm in the US. There are national laws governing use of cleaning agents used with pressure washers, and local ordinances here require one-way valves for sprinkler systems, but I don't believe there are any ordinances governing the connection of pressure washers to the domestic water supply...