[Keith]

I think there's probably a broader argument along the lines of which will remain on FM (and MW), which will remain on DAB/DAB+, and which will exist only via apps.

If I recall correctly AM transmissions are more expensive than FM, amongst other issues. I believe the BBC has announced they'll end all MW/LW transmissions by 2027. It's already been announced that Radio 4 LW will end in March, with it's dedicated programming moving to R4 Extra and R5 Sports Extra. As for 5 Live I've not seen any specific dates mentioned, apart from 'before Dec 27'. Presumably they're yet to decide whether to try and fit it into an FM frequency or move it to DAB, the latter might be politically sensitive.

With FM it looks like the DCMS announced that there would be no switch off before 2030. Hopefully by then all new devices will support DAB+. Presumably when the time comes BBC may have to use the older DAB frequencies for at least it's current FM stations to ensure it's stations can be received by as many people as possible.

On Freeview I could envisage some radio stations moving to app only, due to the increase in devices supporting Freeview Play (and in time Freely). It could be argued that the BBC radio stations could be provided on Freeview via the BBC Sounds app instead.