It's just a pity that the BBC don't want to increase the bit rates of
their services, despite the fact that they've got 200 Mbps of capacity
at their disposal on satellite, with about 80 Mbps being used for the
different regions of BBC1 and 40 Mbps being used for BBCi, while the BBC
network radio stations (e.g. all the ones on the BBC DAB mux) have to
get by with just 2 Mbps. Obviously, the BBC could easily increase the
radio stations bit rates to provide good audio quality without affecting
anything else (you wouldn't miss 0.6 Mbps off the 80 Mbps of BBC1
bandwidth), but they choose to provide lowish bit rates, almost
certainly to minimise the difference between DAB and satellite. See:

I think your time would be better spent campaigning for Satellite rates
to be upped for serious listening use, and leave DAB to the portable and
"couldn't give a toss about the sound" market!....

--
Tony Sayer