Just one little extra point. With the HDR at present, it is better to chase a recording than timeshift live TV. If you use time shift on a programme that is being recorded, the programme will jump to the live broadcast when the recording ends. It's a bug that will hopefully be fixed soon. It's not a problem with a programme that is not being recorded but there are any number of things that you might do that will cause the timeshift buffer to be cleared.
I've got into the habit of pressing instant record rather than pause if I want to interupt a live programme that is not being recorded. I can then do anything I want with the STB, including putting it into standby, and chase play the recording later. Of course, if you are already recording two programmes and are watching one of the still available channels, timeshift is the only option.