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Its Kensington so the test will most probably be along the lines of, "can you point out the Clematis and Magnolia in this picture"

Exactly, mine was like 'can you name those plants in the window behind me' and 'what kind of soil does a camelia need' or 'when do you prune xyz'

That's why I have a team of gardeners, no? :-)
You don't ask a bank manager to point a five pound note.