Originally Posted by x+y:
“I think the Poster means The Big Top 40 show rather than the day to day playlist.”
The Big Top 40 aims to be a national show, if it cam off Heart it would no longer be available on FM in many areas.
Heart covers much more of the UK than Capital and in many areas has the only licence for a service playing current music so Top 40 music is a key part of their remit, if they only played older songs they would not be adhering to their licences as a contempory station.