Caroline is running an online pole on its Facebook page right now.
Online is, not surprisingly ahead with around 30%, and 648, maybe a nice surprise at 25%.
You can vote for more that one method. There are 8 options.
I listen on a Smart speaker in the kitchen, and the App and 648 in the car. If you're in small villages in Kent,Essex and Suffolk, sometimes you lose the phone signal and 648 fills the gaps perfectly. Then you just stick with it.