The likes of Amazon Echo and Google Home, and the forthcoming Apple HomePod, certainly seem to be the next must-have device. Working via a simple voice command and springing to life on hearing their personal ‘wake word’, they can do everything from shuffling a music playlist and providing the latest weather forecast through to ordering pretty much all you could wish for and keeping you on track with updates from your personal calendar. Synced with other devices, they will also control your home heating and security and switch your lights on and off. All good. However, there’s something you need to know.