Reuters: Under-fire oil company BP Plc (BP.L) has started canvassing shareholders about a restructuring in the wake of its Gulf of Mexico oil spill which could include a break up of the business, the Sunday Times newspaper reported. The newspaper, citing unnamed BP insiders, said options included selling the group’s refineries and petrol stations, scaling back its U.S. operations and ramping-up in-house engineering instead of outsourcing. These are on top of the sale of about 10 percent …