For anyone else reading this thread, you can now get aluminium internal sliding doors either frame or surface fixed. These come fully glazed, in the steel look and even as frameless glass sliding doors. Happy to help with product advice and suppliers if you'd like to get in touch. Hope this helps Kind regards, Nick

There’s this one you can buy (seems widely available but price differs a fair bit) https://www.leaderdoors.co.uk/lpd-doors-internal-black-primed-plus-chelsea-4l-reeded-glass-door-cheblaree-p85687 However Pilkington make the glass. You could have a joiner make the door to your preferred style and hopefully your local glazier could supply and fit the glass https://www.ukglasscentre.co.uk/reeded-pilkington-glass

Sorry, just stumbled across this and thought we'd chip in - in case anybody else came across it. There are load of good 3 and 4 bar options with different profiles: heritage internal doors We'd be intrigued to know/see what you ended up going for? And how you feel about it now?

Custom internal doors in non-standard sizes designed for a perfect fit. Enhance interiors with durable, stylish doors tailored to unique spaces, ensuring smooth installation, strength, and long-lasting performance.