SDN is looking for radio, data or small-screen video services to use free capacity on its digital terrestrial multiplex.

Up to 1Mbps of capacity will be released on multiplex A and ITV Plc-owned SDN has asked companies to submit proposals.

According to SDN the capacity is suitable for "a variety of digital services including radio, video (not full screen), and data".

"This capacity has become available as services have moved off Multiplex A as part of the digital switchover process in the UK," the company said in a statement.

SDN's deadline for proposals is April 7.