Retired footballer David Beckham and Chinese basketball megastar Yao Ming will film two announcements with the Duke of Cambridge as part of a campaign against illegal wildlife products.
The videos aim to reduce deman for rhino horn and ivory and will be aired globally.
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The popular game relies on Google Maps, a problem in South Korea as those functions are limited by the government.
A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.