在女皇庄园接见外宾就算用于official Purposes了吧？那这个庄园就不用付税了。
女皇家族不用交遗产税；英国的遗产超过38万就得交税，税率40%，谁都得交，除了王室家族不用交。若按40%交遗传税，估计皇室家产传不了几代就耗光了。但为啥别的英国人就都得交遗产税呢？
至于你提出的付税部分，看看王室如何避税的：
As prince, Charles paid a voluntary 45 percent income tax on his personal income from the Duchy of Cornwall. But the arrangement was shrouded in secrecy, with little public oversight of the expenses claimed against this income. His total annual tax liability was not disclosed.
The duchy itself does not pay corporation tax or capital gains tax. In 2013, following reports in the Guardian that the duchy was deliberately avoiding taxes, British lawmakers said it had an “unfair advantage” over other businesses and called for more transparency.
