(23 Feb 2014, 8:48 pm)tyresmoke wrote I don't have that info I'm afraid. They're to be used on X18 so I don't think there will be any reason why they couldn't be full height but Arriva generally order the low height version these days. I've been told they are B9TL rather than the Euro6 B5TL, though that could be subject to change- like a few other bits and pieces.
I think it might be low height due to side wind exposure and another well, very trivial reason. A rare and odd working on the X21 and X22 on Hartford Bridge section of Fisher Lane, "STOP LOW BRIDGE"!.