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The offshore company owns the house and nothing else. You just buy and sell the offshore company instead. But it still gets really complicated with extra stamp duty, complicated CGT and apparently there is some kind of additional tax on property owned by offshore companies (although not a huge amount).
People are out there to help you manage your wealth. Bet they charge a decent fee and are worth it for the savings. Eg https://www.saffery.com/insights/publications/taxation-of-uk-residential-property/
I don't know what that means.