There used to be circular services throughout Washington.
The 192/193/198/199 was once such example, operating on a combined ten minute frequency from Heworth Metro to Barmston (192/193 went via the Bus-Link; 198/199 went via Waskerley Road), Washington Village, The Galleries, Oxclose, Ayton, Emerson DHSS, Rickleton, Lambton, Galleries, Concord, and Donwell.
I believe these services were replaced, in part, by the 291 and 292 sometime after de-regulation in 1986.
I'm sure the W2/W3 and W5/W6 used to circular services at one point too.
Given the layout, Washington is perfect circular services. It does make you wonder why they ceased.
RE: Service Suggestions