The current service should be revised or a new one introduced say X19

Newcastle - Gateshead -Heworth - Amazon Follingsby- Concord - Nissan - (IMAP) A19 - off at chester Road do a singular loop around chester road /prestbury Road then left past old Sunderland Echo office back onto A19 off to do a loop around Doxford International back onto A19 down to Dalton Park then Peterlee go to Bus Station first then loop around the industrial estate where Caterpillar etc is is before returning to A19. down to Portrack Lane into Stockton then Boro

I know its a different route to X9 x10

The route is primarily to serve workers

and the X10 serves pleasure commuters to an extent

The Sunderland connection is a strange one but vital (CLS vs Chester Road link) to give a quicker link to Amazon Nisaan Doxford Park concord Peterlee and creating that hub to change to give faster links using Pennywell loop or even. grindon loop creates a sense of connection X24 has no real competition from one bus stop area...

but it means a good link from employment purposes

(lets wait for the idea to be ripped apart )

For added seriousness

I think a Fiat Ducato Mellor Orion or a Mercedes-Benz Sprinter Mellor Strata will suit the services as oppose the Coast and Cobalt double buses etc....