Here there are on a bus
https://www.flickr.com/photos/thrashmerchant/4160608167/ First had seats like that on a few of there buses back in the 90s just as bad.
AFAIK, First didn't specify Urban 90s (though did have something similar). However, Arriva most certainly did with East Lancs Lowlanders on long inter-urban services like York to Doncaster/Leeds/Goole or Darlington to Newcastle.
I really can't get my head around people these days citing the Streetlite. Yes, it's lightweight and whines but it's not a patch on the e200 which is dreadful.
However, there are some real turkeys out there. The Optare Vecta was so bad, every operator got rid of theirs prematurely other than Arriva NE; they had so many that they had to suffer though many were parked up VOR and left to disintegrate/were cannibalised whilst many of those remaining had to have the MAN drivetrains replaced with Cummins.
The worst was probably the Willowbrook 003 body, usually on the Leopard chassis. Good chassis but the bodywork was poorly built with drafts from poorly fitted panels, seats were uncomfortable, trim would fall off, with such corrosion that many were scrapped after TEN years.