(03 May 2021, 8:11 am)V514DFT wrote I was on a school time duplicate on Friday (30/4/21) with my son,and a woman sadly had to be denied getting on the bus,which leads me to a question,i know GNE number their school buses with 'S', so why dont Arriva do the same instead of putting a piece of paper in the window and having the destination show its normal route number and destination?

I believe it's because the GNE extras aren't actually duplicates and are actually registered as extra buses services. Arriva are just pure duplicates of a normal service.

Whatever the bus route is registered as has to go on the destination blind legally hence they can't use the S etc.

https://bustimes.org/services/21s-gatesh...-green-bir - There's the 21S for example.