Notable for two Iveco Turbo Daily minibuses, J671LLM in a livery for the 'Oxon Sunny Days Charity', and J671WKV in a plain livery with a large destination display, which makes the crucial part of the plot where the police mistake one for the other a bit of a stretch. I would guess the registrations are fictional.
Frodo Baggins and the War Doctor aboard J671WKV:
The police stop J671MKV using a 'stinger' device across the road. In part of this sequence the film is reversed, so that we briefly see the emergency exit on the wrong side:
They pull the 'stinger' out of the way to let J671LLM through, but this is the bus the bad guy is driving:
This is the only shot of the two vehicles together: