Mizter T wrote:

Plastic seats on the top-deck of said model of London bus is discussed
elsewhere on this thread - you say it's because it's necessary - why?

It isn't really, though it would make vandalism of said seats easier to
remove, and perhaps discourage people from sitting there "out of sight"
where other seats are available.

The point was more that bus companies wouldn't do such a thing if there
wasn't a good reason for it, even as a failed trial. Thus, like the
anti-assault screens, it gives the impression that the bus is perhaps a
less safe (from attack) means of transport than it actually is.

Neil