(08 Oct 2023, 8:24 pm)N391OTY wrote In the good old days, I seem to remember 721 Newcastle to Crook (Northern), 722 Newcastle to Darlington (Northern), 723 Newcastle to Darlington (United) and 724 Newcastle to Bishop Auckland (United). All operated from Worswick Street bus station in Newcastle. I may be wrong about who operated which service but I don't think any of them were jointly operated. Happy to be corrected, though !

The long distance services I remember were as follows:

220 (57) Sunderland - Durham - Bishop Auckland 
230 (40) Newcastle - Sunderland - Hartlepool
231 (45) Newcastle - Houghton - Hartlepool 
721 (42) Newcastle - Durham - Crook
722/723 (46) Newcastle - Durham - Darlington
724 (56) Newcastle - Durham - Bishop Auckland 
X1 (55) Newcastle - Durham - Middlesbrough 

All were jointly operated by United and Northern, plus the 230/220 (40/57) also had journeys operated by Sunderland District. All Journeys from Newcastle were from Worswick Street except the 724 (56) which left from Marlborough Crescent. OK’s Bishop Auckland service also left from Marlborough Crescent but operated via Neville’s Cross not Durham. 

United also also had the Scottish services jointly operated with Eastern Scottish.
504/505/506 Newcastle - Berwick - Edinburgh
508 Newcastle - Jedburgh - Edinburgh
510 Newcastle - Wooler - Kelso - Edinburgh
515 Whitley Bay - Newcastle - Jedburgh - Glasgow