MIG wrote:
I don't think there was such a thing as a 453 before bendys though.
Or a 436. They made overlapping sections with the 53 and 36 which
were shortened, and my impression was that it happened with
bendification.

You're correct (apart from the 453 running with deckers for the first
month or so at first until the artics were delivered). So the yellow
plates would have been on the stops for all of about a week before the
routes were over to pay before boarding.