Twenty million people now listen to digital radio each week, up by two million on the year.

The latest figures from audience research body Rajar also show that 50 per cent of all national commercial radio listening is now via digital platforms.

Indeed, more than a third of the population – 18.2 million adults – now claim to live in a household with a DAB receiver.

At Digital Radio UK, the body that is spearheading digital radio switchover, chief executive Ford Ennals said: “With the launch of Smooth on Digital One, the launch of Radioplayer and significant increases in the number of new cars with digital radio as standard, we look forward to sustained digital growth in the second half of 2010.”