Thanks everyone for their comments! Update: husband has 'over-ruled' on this one. Forgot to mention that the vanity top will be Night Sky Ceaserstone (ie black). So he wants the dark grout. We will definitely be using mould inhibitor and ensuring everything is well sealed. It's all his fault if it looks horrible ;) Will post photos once fully complete. (I am now a little scared...)

It actually looks like it was designed for a shower screen that was never installed, maybe because they ran out of money towards the end of the job? Frameless shower screens look fantastic when you can afford to put one in when you are renovating or building a new bathroom. Usually frameless shower screens have their anchoring points or recessed channels installed before tiling. It is actually quite tricky to retrofit a frameless shower screen neatly where there are existing tiles as the junction between the two materials needs to be watertight, and there may be uneveness in the tiles. You don't want to penetrate the waterproof membrane that is under the tiles with a retrofitted fixing for a frameless shower screen. I would suggest a semi-frameless screen which has a steel channel at the junction between the glass and the tiles which will be easier to keep clean, provide better support for the glass, and not be reliant on a silicone bead (which often goes mouldy in a shower recess). I would not have it longer than a metre as you will need at least 600mm clear to access the toilet. Extend it to the ceiling (see photo above) for better rigidity. A cheaper solution would be an L-shaped shower curtain rod and shower curtain! Best of luck Dr Retro of Dr Retro House Calls

Hello Jo, You'll find that grout in any colour is nothing to be worried about. Grout Technology has come along way and permanent stains and scuffs are hardly heard of. Our suggestion is regular cleaning, using a grout sealer, and using a good quality product such as Ardex if its still a worry. From the Team at Lux Interiors.

What grout have they used? I thought there's a newer grout doesn't need sealing, what's it called, epoxy grout? Also check what they used where the vertical meets the horizontal as it's supposed to be a flexible product but builders don't always take the time to do that correctly, by the time the tiles start cracking they'll be long gone.