IIRC Radio 1 does things like new bands, and has a vast playlist compared to the commercial stations.
There is a report that compared the number of unique artists, unique tracks, and how often each track was played.
It turned out that R1 played something like 2-3 times as many unique tracks in any one month (at least), and had far less repeats of even the most common track than the commercial broadcasters.
It explained why every time I turn Heart on I seemed to get the same tracks from the 80's and 90's within short order
R2 is slightly older radio that combines music with speech.
Then you've got the local stations.
Most of the commercial radio stations in the UK no longer do any real speech, and even where they are meant to do local news they rarely actually have much more than the most barebones, and often their local offices might only be open a few hours a day with most of the playout and presentation either common across the network or recorded in advance.
Could any of the above be done on a commercial basis, i.e. supported by adverts? I'm thinking primarily Radio1 here.