It'd be nice if they'd all settle on one standard method of measuring and expressing velocity, as we have on this side of the pond. But I think they like to confuse us.
I think one reason there is no standard in the UK/Europe is that there is nothing like as much interest in velocity (in my experience anyway).
From my recollection, the manufacturers quoting velocities on the box is quite recent, and I don't think many buyers look anyway.
Generally here, buyers choose the cartridge size (usually 2 1/2 or 2 3/4 for 12 bore) shot size and shot load (often 28 or 30 grammes). Many have a preferred brand. As far as I know ALL cartridges sold are CIP approved, and of course virtually all UK guns are in current proof, so there is little thought of pressure or velocity.
