Mood turns ugly as Telegraph investigates claims that only one in ten tents is occupied at night. The camp forced St Paul's to close for the first time since the Blitz and is costing local businesses thousands of pounds a day. But footage shot by The Daily Telegraph on a thermal imaging camera appeared to show most of the dozens of tents in the cathedral churchyard were empty. And when the remaining protesters realised what The Telegraph was attempting to verify this, the mood turned ugly. The site was quiet at around 12.30am with the faint smell of marijuana smoke...