High Quality Content by WIKIPEDIA articles! In the United Kingdom, the roll-out of digital radio is proceeding since test transmissions were started by the BBC in 1990. The UK currently has the world`s biggest digital radio network, with 103 transmitters, two national DAB ensembles and 48 local and regional DAB ensembles broadcasting over 250 commercial and 34 BBC radio stations across the UK. In the capital, London there are already more than 51 different digital stations available. In addition to DAB, radio stations are also broadcast on digital television platforms, Digital Radio Mondiale on mediumwave and shortwave frequencies as well as internet radio in the UK. Digital radio ensemble operators and stations need a broadcasting licence from the UK`s media regulator Ofcom to broadcast.