(29 Dec 2014, 8:15 am)Andy4014 wrote Just a quick question, do the Ashington X21/X22 Sapphire Enviros stray onto other routes much? I've been looking through timetables and they appear they should interwork with 35 on evenings and Sundays. Does this happen in practice?

They do work the 35s on evenings and Sundays. Also work the last X20 on Saturdays (1810 ex-Newcastle).