Here's why Capital FM is rubbish : they've only got about 7 CDs in their collection, and even those are singles. Which for a radio station is piss-poor.
Here's my evidence :
Last week, Thursday and Friday, I went to work with my dad. This involved getting up at 5:15 AM to leave at 5:30 and got home at about 7pm. And thus I was listening to Capital FM all day : in the car, all day at work, in the car on the way home again. As someone who listened to Capital non-stop for some 14 hours two days in a row, and also has the slightest bit of common sense, I now consider myself an expert analyst. A strange pattern started to emerge : they were playing the same songs all day, (adopts tabloid-style 'disturbing fact' text type) IN THE SAME ORDER. And I can name those songs, in the very order that they were played in, by The Bloke Before Chris Tarrant, Chris Tarrant, Steve Penk, Martin Collins etc :

Song 1 : Here's where the Story Ends - Tin Tin Out
Song 2 : Horny '98 - Mousse T (Eh? Who?)
Song 3 : Whistle Down The Wind - Tina Arena
Song 4 : Brandy & Monica - The Boy is Mine (or something)

In fact, the loop was only interrupted when someone phoned up Dr Fox to ask for REM's Shiny Happy People, and also once where Martin Collins played 3 Lions. That was just the Thursday.
Unbelievably, the same songs occured on the Friday.
Conclusion : Capital FM is rubbish.