Hi Sunny, I'm guessing the layout is like this then? Which is why you wanted a 900mm wide shower. I'd actually go with the 900 x 1200 as it's longer and will suit the room better, plus, if the layout is like this, then you have the room for it. Here's a link to all those in that size from Victorian Plumbing, so depends what your style is. Victorian Plumbing. They sell loads, so i'm sure you'll be able to find one that will suit. One thing to watch out for is the size of the basin and toilet. You will be better off with a short projection toilet and don't come out too far with the basin either as the space to exit out of the bath will be lessened. Regards to flooring, tiles etc, that's personal choice. What style do you like, what colours do you like, and most importantly what is your budget for the project?

Hi. I take it you want the rigid arms rather than the normal flexible arms of a spider light? Here’s one similar https://www.e2contractlighting.co.uk/product/minimal-geometric-antique-brass-chandelier-cl-38765/

Original Style have some beautiful things and you could do well to look there. I don’t work for them and have no connections to them but I’ve found them immensely helpful lately (I live within reasonable distance from their Bournemouth store). My first encounter with them was about 20 years ago. (And ask for a discount…you never know! )

Given the "pattern" of the surface goes all the way through, that'd mean real stone/marble would have to be a full - and possibly thick - slab, milled down and then polished to the fluted surface. The price for that, and the substructure/installation cost for a real stone slab of that size and weight, is going to be in the range of "whatever - don't do it if that matters in any way". I mean, crazier things have been done in London for sure, and you'll find natural stone fabricators willing and capable to execute this. I wouldn't preclude a custom commission but agree with others, it's probably a form of large-format porcelain. Have you considered contacting the developer directly ?