Said not with words

S10E2; The animal within

Ben Jones facial expressions and body language are always amazing.

Here someone who finds themselves in a corner metaphorically and physically in the interrogation room proclaims, "I saw the murderer!" A second after this screen shot was taken, even Barnaby reacts with exasperation by covering his eyes.

As a side note, that cornered person is an American businessman who drove into the village listening to loud country music as American businessmen from Philadelphia do. He also looks to be wearing steel toe work boots like those below which is, of course, what an American businessman from Philadelphia who has meetings in London would wear.