Episode 1.01
As DI Elaine Renko flags down a taxi, a Bob's Tours MAN is parked on one side of the street, while facing the camera is Top Marks Travel B10VNL, a 2001 Volvo B10M-55 with Van Hool Alizee coachworks. This coach has carried several different registrations, but was new to Jones, Pwllheli:
Episode 3.01
A bus is the scene of a brutal knife attack. It's Sullivan Buses E44 (LJ09OJZ), a 2009 ADL E400 new as Travel London 9467: