From bidets to ballcocks, bathroom online sales are booming. A third of canny customers fitting out a new bathroom want cheap online deals. Online plumbing sales are predicted to soar by 50% by 2018. But what about the showrooms and sales staff that help customers touch and feel their dream bathroom? Will bricks and mortar retailers stock brands when they are smart-phone price-checked by customers in the showroom, and then bought online for half the price?