12 hundred children in the UK are born with a cleft lip or palate every year. Little is known about what causes it.
To help provide some definitive answers, the world's biggest ever research programme into the condition has been launched, with Bristol experts leading the project.
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Hotter again on Monday with temperatures up to 25 degrees. Cooler on the coast and on the Isles of Scilly.
A clear night, hotter again on Monday.
Highs this afternoon of around 23 or 24 degrees. Cooler on the coast.