(08 Sep 2015, 3:49 pm)R852 PRG wrote Not sure on the law at all; but I remember reading that unless in a designated bus station, buses cannot be reversed without supervision. If it was supervised, there's nothing illegal about it.
I remember having to sit at Hill View, Sunderland (on a Stagecoach 19 service) about five years ago, until police arrived to guide the bus driver through a safe reverse maneuver. It took about 20 minutes and held up other buses as a result.