(16 Mar 2021, 2:05 pm)markydh wrote Just to provide devil's advocate, given the teeth gnashing, it's worth remembering that Stagecoach only have NSAs available on 20-odd deckers in Tyne & Wear.  So, frankly, not mandating such technology is as much about them as it is about the little boys.

Definitely, there's absolutely no reason why the likes of Stagecoach haven't been installing NSA for a decade now, when you're spending the best part of £250k on a decker, the cost of specifying NSA is likely to be negligible.