Also, just worked out potential timings based on the X70 returning and X73 being introduced. Would be a PVR of 10x either way according to the screenshot. Most viable working pattern based on traffic and layovers for recovery (rather than a long layover at Consett) would be something like this using estimated running times (used the 'old' 6 times as a guide for the X73).

See attached screenshot for further info. Times on the left are with tighter turnaround times in Stanley, but extended Consett layover. Times on the right are with more recovery time in Stanley and still a fairly decent amount of time in Consett.

X70 > X73 > X72 > X71 (CON-NCL-STY-NCL-CON)
X71 > X72 > X73 > X70  (CON-NCL-STY-NCL-CON)