Both mum and baby are doing well after PC Robert Morgan helped with the delivery after being flagged down in the middle of his shift.
The new baby girl doesn't have a name yet but she's happy and healthy.
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Gianni Versace never got to live in the four-bedroom home as he was murdered before the purchase was completed.
The pop-up, called, Annie the Owl, will open in Soho in March where guests will sit in the company of owls.
The designs were unveiled as Boris Johnson claimed the flats and houses would be built six years earlier than planned.