He told to ITV News Social Affairs Editor Penny Marshall that the UK should encourage companies like, "some of the great companies of the past like Cadbury's, who have a deep sense of social utility and social value," to help those on the lowest wages.
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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.
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