There I was sitting on the Strand when a bus with 31 on the back stopped on the 32 stop outside Debenhams. I asked the nearby controller had the stops been changed since I left. In a moment he was heading across the road to sort out the problem. The driver didn't have incorrect blinds up as the front proclaimed the bus was a 32 and therefore in the right place. After a few attempts to correct the problem the bus headed of in the direction of Marychurch. So if you found yourself running after a 31 that turned out to be a 32 it wasn't the driver's fault, just a broken destination blind.