The Labour party conference is under way and Ed is already taking flak from unexpected quarters – and not just his brother. Yesterday Marks and Spencers were the latest to twist the knife, with their stand in the conference zone cheekily declaring support for “Plan A. Because there is no Plan B”.

Obviously they’re only talking about plastic bags and it’s nothing to do with M&S chairman Sir Stuart Rose being a Tory donor and a signatory to the infamous Telegraph letter backing George Osborne’s spending review in 2010. Obviously…