Detective Superintendent Stephen Ratcliffe said this was "a gang of experienced criminals who had been the subject of an investigation by the special projects team at the Metropolitan Police for a couple of months before this robbery."
More top news
City Hall wants market traders to embrace new technology in a bid to breathe new life into local high streets.
Dry through the evening and overnight, with clear skies.
The teenager, believed to be Jack Susianta, smashed a window at his home and fled after officers were called to the property in Clapton.