The sound became more noticeable through the week, with even my sons all mentioning it to me this weekend. It doesn't seem to affect Mera's drivability, but I've set up an appointment for her in a couple of days. Hopefully it is a minor problem that can be easily repaired.
Poor Mera, first she has to wait to have her bumper repaired after the accident, and now she has to deal with the indignity of rattling her way down the road.