Plug a cheap dongle in your telly and fling cool stuff you want to watch to it - Chromecast is a brilliantly basic concept to understand and its success (20 million sales and counting) is well earned.

Since it was first announced in 2013, the Chromecast has become a household staple for many. Its genius has always been its ease of use. You simply tap a button on your phone, and whatever you were ...