Not sure exactly when they changed but I noticed new plastic trolleys in Dickson today. I have my doubts that entirely replacing a fleet of salvageable metal trolleys with plastic ones (even if recycled plastics) is actually "pushing for a greener future".
Yeah, if their trolley fleet was due for an upgrade perhaps it would make sense. I do wonder how durable the plastic trolleys are long term being mistreated and left out in the elements.