Morrisons’ Sittingbourne RDC is fast becoming the venue of choice for Tory politicians. The Kent depot, visited by David Cameron on the 2010 election trail, was used by Chancellor George Osborne this week to deliver his speech on the biggest overhaul of the benefits system for decades. “This month, around nine out of 10 working households will be better off as a result of the changes we are making,” he told Morrisons staff.