The Duchess, who is in the Guinness World Records Book for having the longest fingernails on a woman, tells ITV's Daybreak she can drive, write and go to the toilet without any inconvenience.
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Prince Harry is in Toronto, the host city of the Invictus Games, ahead of Saturday night's opening ceremony.
The Prime Minister said she expected an implementation period of "around two years" as she called for a "creative" approach to talks.
The first signs of autumn are appearing as the equinox marks the start of the season.