Our shower tray is not flat to the floor and sits on a ply base to conceal the waste, so we have to decide how to edge it. It is 10cm tall and the options are –

1) use the same tiles as the wall – we have lots left and they are the correct height.
2) use the same tiles as the floor
3) use white porcelain tiles to match the shower tray.

I am leaning towards option 2…