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You can have a smaller total area if you go vertical with your filtration area, although it will require a better pump setup, this kind of thing:
https://www.youtube.com/watch?v=1NSsORP4WFw
David Pagan Butler has built ~180m2 natural pools for ~£6k and ~50m2 pools for~£2k.
There's someone on YT with a teaser video to get you to buy their DIY how to. They used sleepers and sand bags.
When I looked into it (out of curiosity) about 15-20yrs ago size was one of the big factors. You basically need to at least double the area (½ for the pool ½ for the plants) and the there's a minimum size it needs to function properly as an ecosystem.
So even as a starter you need to basically double the cost of loads of stuff over a normal pool. Idk if you use the same pump and filtration systems, but if you don't I bet you get gouged on that due to the tiny market.
Also that expert he hired surely wouldn't have charged less than £5k +VAT. Although if he's an architect I assume all the figures he quoted were ex VAT anyway ;)