The A23 corridor (I'll break it down into Brixton & Streatham)
Brixton:
Route 2: Currently uses Euro III VLA's though Euro VI HV's are on order
Route 3: Currently uses Euro VI LT's
Route 35: Currently uses Euro VI EH's
Route 37: Currently uses Euro IV E's - potentially its E's could be swapped out
Route 45: Currently uses Euro III PVL's - out for tender soon so maybe a new order (if one is made) might come early
Route 59: Currently uses Euro V LT's
Route 109: Currently uses Euro VI Enviro 40H MMC's
Route 118: Currently uses Euro V E's - potentially its E's could be swapped out
Route 133: Currently uses Euro V HV's & Euro VI HA's - Euro V HV's will surely be upgraded
Route 159: Currently uses Euro VI LT's
Route 196: Currently uses Euro IV E's - I believe it's out for tender in the near future so maybe another early order
Route 250: Currently uses Euro V T's - potentially its T's could be swapped out
Route 322: Currently uses Euro VI SE's
Route 333: Currently uses Euro VI HA's
Route 345: Currently uses Euro IV Enviro 400's - the 345 might actually be exempt as it only crosses over Brixton Road rather than actually run along it
Route 355: Currently uses Euro III LDP's - out for tender soon so maybe a new order (if one is made) might come early
Route 415: Currently uses Euro VI Enviro 40H MMC's
Route 432: Currently uses Euro V WVL's - potentially its WVL's could be swapped out
Route P4: Currently uses Euro III Pointer Darts & Euro IV Enviro 200's - potentially its buses could be swapped out
Route P5: Currently uses Euro V SE's & Euro VI SE's - potentially its Euro V SE's could be swapped out
Streatham:
Route 50: Currently uses Euro V DW's - potentially its DW's could be swapped out
Route 57: Currently uses Euro IV E's and Euro V WVL's - potentially its buses could be swapped out
Route 60: Currently uses Euro IV T's & Euro V T's - potentially its T's could be swapped out
Route 137: Currently uses Euro V LT's
Route 201: Currently uses Euro VI Enviro 20D's
Route 249: Currently uses Euro III PVL's though Euro VI HV's are on order
Route 255: Currently uses Euro V ENL's - potentially its ENL's could be swapped out
Route 315: Currently uses Euro IV SEN's - potentially its SEN's could be swapped out
Route 319: Currently uses Euro V HV's - Euro V HV's will surely be upgraded
Route 417: Currently uses Euro V DW's & Euro III VLA's - potentially its buses could be swapped out
Route G1: Currently uses Euro VI SE's
Route P13: Currently uses Euro V Enviro 20D's & Euro VI Enviro 20D MMC's - potentially its Euro V Enviro 20D's could be swapped out
NB: Based on a Streatham Hill to Streatham Common corridor