You'd think the whole world did from the news coverage of this. But basically HMRC have cocked up meaning they've undercharged a few people and overcharged lots more. So there's more likelihood of getting money than losing it. You might get a letter saying this. You might now, in which case, carry on...
Though that Daybreak programme was making out that you - YES, YOU! - have been wronged either way and should probably consider some sort of legal action involving a form beginning with the letter 'A'.
I dunno. Tax eh?