ANTI-HEATHROW expansion activists slammed Rachel Reeves for “mis-selling” the third runway to the Treasury as she prepares to leave No 11 when Andy Burnham becomes PM in just over a week.The likely outgoing chancellor convinced her department to back the project with “panglossian figures” without commissioning an impartial economic assessment, campaigners said.No 3rd Runway Coalition chair Paul McGuinness accused Ms Reeves of using data commissioned by Heathrow Airport to “coax” her Labour colleagues into supporting the expansion.