I'm starting the process of compiling a list of localities with artics operation (excluding airport internal operations), however it is rather slow as I have not managed to travel much lately. So far I have:
London (London Central 12 436, London General 453, Stagecoach 25, Arriva 29 73, First 207 - Mercedes Benz)
Leicester (Arriva 80 - Mercedes Benz)
Nottingham (NCT 4 - Scania Scania/Wright)
Coventry (NX Coventry 17 21 27 - Mercedes Benz)
Birmingham (NXWM 67 - Scania)
Manchester (First 8 135 - Volvo/Wright Scania)
Leeds (First 1 4 - Volvo/Wright)
York (First 4 P&R - Volvo/Wright)
Swansea (First 4 - Volvo/Wright)
Luton (First Airport Shuttle - Volvo/Wright)
Newcastle (Go North East X66 - Scania/Wright)
Cardiff (Cardiff Bus 6 17 18 - Scania)
Bournemouth (W&D U1 - Mercedes Benz)
Brighton (B&H 25 - Mercedes Benz)
Eden Project (First P&R - Mercedes Benz)
Bath (First 18, SPA1, SPA2 - Volvo/Wright)
Glasgow (First 9, 66 - Volvo/Wright)
Glasgow (Stagecoach)?
Aberdeen?