The new X21 EcoCity's have a different gearbox, have a far better power delivery and a higher limited top speed (60mph) so they shouldn't have any problems. Famous last words...That's good, look forward to riding them down the A19. At least the Solos are off this route now you'd be deaf if you were subjected to one down the A19, the A689 between Rushyford and Sedgefield was bad enough.
RE: Arriva bus changes!