It’s not Prime Minister Boris Johnson’s job to make sure shops have their shelves full, Foreign Secretary Liz Truss said on Sunday amid fears that people may not be able to get their usual Christmas supplies. The prime minister is facing pressure to solve the shortages of heavy goods vehicle (HGV) drivers and other labour shortages as a disruption in the fuel supply chain turned into a full-blown crisis after panic-buyers dashed to forecourts to fill their cars over the past 10 days. Brian Madderson, chairman of the Petrol Retailers Association, told Sky News on Sunday that while there were only “one or two dry sites” north of London and that the “general improvement has continued,” the situation in London and the southeast remained difficult. Speaking at a Telegraph event at the Conservative Party conference, Truss said it’s not up to Johnson to fix the problem. “I don’t believe in a command and control economy, …