My memory of buses from my younger years has always been Leyland Atlanteans, and a particular fondness for the 500 batch, hence my avatar and username. Here's some of the routes I can remember:

20: Wallsend - Benton via Walker (I think)

21/22: Wallsend - Throckley

35: Wallsend - General Hospital (not 100% sure)

49: Wallsend - Throckley via Cochrane Park

301: Whitley Bay - Gateshead/Metrocentre

302: North Shields Ferry - Gateshead

305: Wallsend - Newcastle via Hadrian Park

307: Wallsend - Newcastle via Redesdale Park

310: Whitley Bay - Sunderland

313: Wallsend - North Tyneside General Hospital

319: Cramlington - Sunderland

321/322: Holy Cross - Battle Hill (And maybe Benton Hypermarket?)

340/341 Wallsend - Hadrian Park