Hello Brian,
Sorry for the late reply. The tiles are fairly common. The trick is getting a tiler who will spend some time figuring out the best geometry. In this case, it was Colin Barbour, londoner.cb@gmail.com , who operates out of London SE15 if it helps.
For the tiles, try www.wallsandfloors.co.uk/category/Victorian-tiles/
Best, Clarissa
Maybank and Matthews Architects Ltd