(10 Jan 2016, 9:48 pm)GX03 SVC wrote Then the moans would begin about a X21/X22 vehicle on the X18.

It's a Sapphire ffs.

Where does the X18 come into this?

I hate to sound patronising but we are discussing 7518 being allocated to services X21/X22 or however it works on a Sunday.

I should probably say that I agree with your point that it is a Sapphire vehicle allocated to a Sapphire service - doing the job it was intended to do. However, we all know that on Sundays, the PVR of most services is reduced. In this instance, however, it would have been more sensible to allocate an X21/X22 branded vehicle rather than the spare. 

To be honest, why can't they just add route vinyls for the X21/X22 onto 7518 anyway. They are the only Sapphire routes at Ashington and even if it was to appear on a different service, it would still be classed as a rare/odd working (even if it does happen quite often).