Most of the stagecoach services were merged years ago.. think this helped but services..

3,4,12,13,16,20 and 23 all run every 10 mins with

4/13 both running to town end farm- mon - sat combaind to make that area have a 5 min service.

12/13 - both run to silksworth - combained a 5 min service.

We have the 10/11which run every 7/8 mins on parts of its routes.

5/5A, 18/19 are the half hourly services
39 is only ran on evenings.. NEXUS contracts

Hopefully some1 can explain it better