Well finally, a week after I was told I would have the quote, we received this today.
Pretty much as expected, mosaic tiled feature walls are too expensive and will be deleted. We will probably just have mosaic tiles in the niches in all 3 bathrooms.
We have been charged for Underlay - since when do tiles have this? And even if it needs Underlay, shouldn't this already be included in the costs. I have asked for clarification on this.