Just something I was thinking about while sitting on an X7, 30 Minutes late again and remembered why I never use this while an X7 standing load on a single decker and an X8 following it in the other direction both also 30 Minutes. 

What's the most unreliable route in the North East due to reasons beyond the operator so not driver cancellations etc as the X7/X8 lately must be hard to beat?

I know it's always been a hated route for drivers though even in its 363/364 days.