Christina Paterson, 23, rushed to the calls of her co-workers to find that 54-year-old car valet Andrzej Derlatko had suffered a heart attack.
"Everybody was shouting 'call an ambulance' and saying he was dead. He certainly looked dead. He was lying on his back in a puddle, with his mouth open. He'd swallowed his tongue. He'd gone cold and blue. Everybody was crying but I thought 'there's still a chance'," said Ms Paterson, who works at a Mercedes Benz dealership in Edgware Road.