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If it is a conservatory then it needs doors from the rest of the house and a separate heating system. Maybe it has both of those.
Or maybe they just engineered it really well. But there's a lot of glass in there.
Looking at the pictures in detail, then yes, it's a fancy conservatory / lean to affair which can be closed off from the rest of the house.
Hmmm… I’ll ask next time I see them! I’d guess it’s a different type of classification? Not part of the house but an adjoining structure like a conservatory? Total guess. Maybe it just passes normal regs?