It would be great if you could provide some details of your insights ...
There is a great website to analyse & compare the playlists of UK radio stations:
comparemyradio.com/
One example:
BBC Radio 2 compared to Capital FM (last 30 days)
Capital FM played 163 unique tracks
BBC Radio 2 played 3,259 unique tracks
The stations share 23 unique tracks
Capital FM shares 14% of its playlist with BBC Radio 2
BBC Radio 2 shares 1% of its playlist with Capital FM