“By striking an agreement with the GMB, Deliveroo PLC (LON:ROO) is hoping to ride away from rising concerns about its reliance on the gig economy model, but this could be wishful thinking. The delivery company is on a fresh PR collision course over this deal. The IWGB union which represents couriers is calling it a cynical and underhand ploy to undermine the appeal it’s bringing to the Supreme Court in the case it’s fighting for statutory collective bargaining on behalf of Deliveroo contractors. Under the GMB agreement Deliveroo promises to give self-employed contractors guaranteed minimum ear…