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conservatory companies certainly play fast and loose with regs etc.
by the by - my wife saw this blog and said she wanted a 'pebbles garden' so I bought 3 tonnes of pebbles and shovelled them in like a mug. It was stupidly uncomfortable to walk on so I had to build decks and paths (with deck boards) to make the garden usable. It was however a reasonably cheap and simple way to fill the space where the concrete patio had been and i think if we'd used smaller pebbles - less agony underfoot.
I would worry about ground floor temps with this kind of structure with the doors taken out. I've posted in the home-owning thread previously about our kitchen conservatory, which is a similar setup, and does not perform well (we pretty much abandon the kitchen table for winter because it's so cold in there).
https://www.aliceinscandiland.com/blog/2017/03/12/how-to-extend-your-home-with-style-for-less-than-you-might-think