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Thanks, jogamel. it was the missing UN that threw me. I was rubbish at tennis and squash - crap hand to eye co-ordination - and was unwittingly bagelled many times!

Not quite zero confirmation. A Google search for the location plus the phrase will lead you to page 23 of this book, which discusses the feature explicitly. https://books.google.co.uk/books/about/The_Staircase.html?id=hwnQYdhIHDwC&redir_esc=y

Thanks Luftmensch, that was well spotted.

As per usual I didn't scroll down far enough so apologies to Elpenor:-)

That's quite deeply buried information! I stopped pondering when I found that the garden (as the garden is specifically mentioned in the preamble) uses levels to create a particular visual effect...best viewed from the top of the staircase.

I don't have the puzzle in front of me but I think it referred to the garden designer rather than the other architect? Doesn't the garden chap have a role to play in the end game?