Dr Simon Harding of Middlesex University London, who is behind new research that has found dogs are being used as business assets, explains his key findings:
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Those gathered on the bridge fell silent at 2.40pm - the time the first call was made to police exactly seven days ago.
Simon Lucy, 61, filmed hundreds of hours worth of footage on the London Underground network.
He delighted fans as he started off his performance playing his song 'Ordinary People'