(07 Dec 2020, 7:37 pm)Malarkey wrote  Very true given the 50 turns left before Waldridge Park in order to serve Embleton Road End, 

Do you think anyone from Waldridge Park would perhaps take the short journey on the 25 to Sacriston then get the X20 down to Arnison Centre? 

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I'd hazard a guess the Cobalt B9's displaced off of the 311 will be used on the Coaster given the poor reliability of some of the B5LH's as has been the case for a few weeks now.

I certainly wouldn't fancy getting two buses to and from the shops and hanging around Sacriston or Witton Gilbert waiting for a connection. 

(07 Dec 2020, 8:14 pm)big mac wrote Then people would kick off about the 21 not serving Chester Moor and Clifford Terrace.

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It would be interesting to see how many on Clifford Terrace or Chester Moor would be affected.
The X21 could easily be an all stops through Chester and I can't see it making that much difference in the grand scheme of things, particularly when you consider the stopping arrangements of some of the other expresses. 
Not saying it's ideal and I'm not really a fan of expresses being stopping services (contradiction in terms of there was one), but it would certainly make up for any diversion of the 21. 

To be honest, I would imagine the residents of Chester Moor would be happy with the 21 being diverted closer to the majority of the houses there.