(17 Jul 2014, 5:40 pm)AdamY wrote True.
But the service will be Saturday-only if it's going to interwork with service 128 which means it will have a rather minimal affect on the services you mention.
Another suggestion would be to extend service X43 from Stanley to Beamish (and also from Metrocentre to Newcastle Central Station) on Saturdays with both legs of the extension operating as a non-stop service.
Then you are potentially duplicating the 43/44 with a Newcastle - Durham service.
The x43 idea could work