Updated: Jun 24, 2020
We have had a few cases where a large window, French doors or some other feature means your TV has to be mounted on a side wall, not opposite you. Now, most people won't want to have to get up to move the TV out on a pull out bracket (especially in winter when you're in bed), so the clever folks at Vogels (https://www.facebook.com/VogelsExperience/) have a nifty motorised bracket that pops out when it senses the TV turn on and pops back when its off. Easily setup via mobile app and remembers its 'home' and 'out' positions.
Cost is around £750 + VAT.