I have found that BBC Radio 2 (I know, showing my age!) is about 2 minutes behind on the song info i.e. it takes most of the song currently playing before it updates to show the title. Other DAB stations, like Absolute R, update the instant the song starts. You would have thought the BBC, with its squillions of public subsidy, would be able to keep on top of the technology better than some of the really small operators.
I also find that in the Southeast, outside of London, I really struggle with reception on DAB, and invariably switch to FM.