The doctor that led the team that delivered the royal baby - the Queen's former gynaecologist Dr Marcus Setchell - is with Kate at the Lindo Wing of St Mary's Hospital in Paddington.
Rumour among the media outside is of an early departure.
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Officers wanted to know whether he and his mother were Muslim or not, according to his lawyer.
German police say a man drove a vehicle into people in a central square in the city of Heidelberg.
The London Mayor insisted he was "not saying that nationalists are somehow racist or bigoted" after outraging SNP supporters.