More linguistic anachronism in Downton Abbey

"Sod this! I'm bushed!" announced Jimmy the footman as he audaciously plumped himself down into one of the drawing room chairs at Downton in the final episode of Season 3. (Yes, yes, I know there were more startling and upsetting things that happened in the episode.)
Would a young Yorkshireman have said this circa 1920?
Highly unlikely!
Until recently, British dictionaries were labelling the "tired" sense of "bushed" as North American only, then "esp. North American". The two most recent editions of the Oxford Dictionary of English no longer label it, so I guess it has now made its way into British English.
But it certainly is North American in origin, having been used since the 1870s. Perhaps Jimmy picked it up from that racy maid of Cora's mother's.
For more linguistic anachronisms in Downton, see this post.
For another Downton-inspired post, on the word "valet", please click here.