Amazon has been beaten by archnemesis Google in its own Prime Day sale. The blockbuster 48-hour sales event sees thousands of popular products slashed in price for those with a Prime membership — or those who’ve signed up for a well-timed 30-day free trial of the loyalty scheme. Amazon has cut prices across its line-up of Fire TV Stick streaming gadgets but hasn’t done enough to topple rival Chromecast with Google TV when it comes to an affordable way to stream in 4K Ultra HD. You’ll need to pay £3 more to watch in 4K quality on Fire TV devices over the competitor from Google. View Deal | Chro…