So I learned something today. I’ve just bitten the bullet and bought a no-name generic Bluetooth 5.0 USB dongle off the Internet which arrived this afternoon. What I wanted it for was to be able to transfer files between mobile phone and PC without having to scrabble around for a USB A-to-C cable I can never seem to find when I want it. So I plugged the dongle in, Windows auto-installed drivers, the Bluetooth icon appeared in the system tray and I was able to pair my phone with it.