So how, exactly, is it a good way to teach British English any more than a picture or an image?! The fact it's wordless means you can use it for any variant of English!

It is wordless, but the cultural nuances that it touches upon are priceless.

Like in one episode where he is at the beach with a blind man on a deck chair, that could well be a lead in for a discussion and explaination about the british seaside.....I grew up not too far from blackpool and southport so they were interested to know about why british people liked to go to the seaside. Endless possibilities with mr bean.