My mistake with Monaco - I really though they had to have male heirs. And as I said Japan can very easily fix their succession issues.Monaco does not need a male heir; they have male-preference primogeniture (which is why Princess Gabriella is not first in line to the throne), but women can still inherit.
Prince Hisahito's birth delayed things in Japan, but eventually there will have to changes in the succession to the Chrysanthemum Throne. They have three people in the line of succession.
Chatto and of no real relevance, here's her beautiful wedding dress from 25 years ago.
And my bad with the typo of Sarah Chatto's name - her dress was beautiful and the Snowdon Flora Tiara is gorgeous as well!!!