Think of the poor drivers in 'bristol city' - ie Derry, or a close runner Craigavon where RELLs are plentiful.
Also think of the grade 2 drivers where they are driving bristols virtually every day, day in day out for sometimes months on end.
I have to say some Bristols would hardly pull the skin off a rice pudding (2374 ahmmmm), but others you couldn't beat with a big stick (2279) then others would shake you to death (2283 ahmmmm).
But when the chips are down the Bristols are workhorses and some could keep working for another 5 or so years, on the otherhand, some are long overdue to go into the bus retirement home aka Beatties of Hillsbrough.