[3] In August 1994, the route—at the time operated by Leaside Buses—was used to test satellite monitoring of buses in an effort to reduce bunching.
[4] On 4 September 2004, route 73 was converted to one-man operation, with the AEC Routemasters replaced by Mercedes-Benz O530G articulated buses.
[10] On 3 September 2011, Arriva London commenced a new contract with operation transferred to Stamford Hill garage and the route converted back to double-deck operation with 20 hybrid Wright Eclipse Gemini 2-bodied Volvo B5LHs and the balance diesel Wright Gemini 2-bodied VDL DB300s.
[13] In December 2012, route 73 was converted to full hybrid operation with Wright Eclipse Gemini 2-bodied Volvo B5LHs.
[18] In August 2014, two buses on the route were fitted with equipment designed to enhance bus drivers' awareness of pedestrians and cyclists as part of a six-week trial.