I'd probably go a step further and suggest the message behind the video is that Radiohead are taking a pop at nationalism and jingoistic patriotism and saying that there's the sense that community in Britain is only achieved through the shared experience of dunking on others lower down the chain (the poor, immigrants, ethnic minorities), and that anyone who seeks to challenge (or is seen to be challenging) the status quo is deemed an "outsider" and one not worthy of "belonging". Thus the scenes of anglo-saxon, pagan ritualistic behaviours and ceremony stand in for this "post colonial melancholia", whereby England is forever looking backwards to tradition and this sense of a green and pleasant, bucolic and "albionic" version of itself, unbothered by progressive attitudes, multiculturalism or sections of society that seek a more culturally and politically liberal stance.
