[1] It follows the city's middle ring road with some small deviations on parts of the route.

The service dates back to the days of Birmingham City Transport.

Like the Outer Circle service 11, buses on the 8 travel both anti-clockwise (8A) and clockwise (8C).

[3] In 2004, the Birmingham Repertory Theatre staged the musical "Ridin' The Number 8" by Laurie Hornsby and Euan Rose, in which a cast of 'Brummie' characters board an Inner Circle bus and reminisce about the people and places they encounter along the route.

[4] In October 2020, the 8 transferred to Perry Barr garage upon the closure of Bordesley; where the routes had been operated since 2005.