Although the Jelly Bean update has been available to U.S. owners of the Asus Transformer Pad TF300, it has not yet come to the European version of the tablet, until today. We have multiple reports that Jelly Bean will start rolling out today to European Transformer Pad TF300 tablets starting in the UK. We don't yet have any official confirmation from Asus, but sound off in the forums if you have started getting your update.
Source: TransformerForums via AndroidAuthority