Not the winter of discount tents

'Empty tents' was one of the defining stories of the week, and certainly one of the defining images. But now the protestors are fighting back, with a video claiming that in fact it wasn't that the tents outside St Paul's were empty - the cameras just didn't pick up the people inside them.

It's a compelling video, but the Times, which first commissioned the thermal imaging photos, is standing by its story.

Mr Wallace said that he was satisfied that his techniques were robust and could detect whether people inside tents. The apparent “disappearance” of protesters behind the cold canvas was due to the time taken for body heat to transfer to the external surface, he said.