Reuters: BP Plc on Sunday rejected a charge by U.S. Representative Ed Markey that the British company had understated the size of the Gulf of Mexico oil spill. “I don’t think there’s been any underestimating,” BP spokesman Toby Odone told Reuters after Markey released a document that the congressman said shows BP has been deceptive. The internal BP document released by Markey on Sunday shows that the company estimates that a worst-case scenario rate for the Gulf of Mexico oil spill …