Lab cushions bath

I'd like to buy a bath and shower enclosure in unusual sizes. Who makes them? (if anyone!)? - standard shower enclosures

I want a bath of about 1,800 marked 750 mm (steel or acrylic) and an offset quadrant shower 800 x 850 mm D with the right side 850mm, ideally in a design "without frames" or semi - frameless Slimline Take a stone trough and sliding doors. Are there any manufacturer in the United Kingdom who are not standard sizes like?