Roku updates the Roku Express with 4K and HDR at a very competitive GB£39.99 (sometimes reduced to £29.99). Perfect for all HDMI TVs, the Express uses 11ac (and 11bgn) WiFi to deliver all the main UK catchup channels - iPlayer, ITV Hub, All4 and My5 - plus the usual on-demand providers - Netflix, Amazon Prime, YouTube, Now TV and AppleTV.