Like the idea of the very large marble tiles - less grouting, plus the preformed shower tray is a practical solution to insisting on a traditional wet-room floor.
Compact space for shower room
glass enclosure + wood floor -- make the doors fold in to save space when not using the shower
Bathroom ideas £70 per meter
Simpsons - Grey Textured Slate Effect Shower Tray with Waste - 5 Size options
shower; I like this bathroom minus the shelving choices.
En suite / down stairs shower room 2
Regal Vanilla Matt Bathroom Tiles http://www.wallandfloorsolutions.co.uk/regal-vanilla-matt-600x300mm.html
Teak Shower Floor Inserts | various pre-made sizes or custom.
Playtime walk-in shower 1400 £479. Don't want shower tray