standard was Granada in November 2009 (with existing switched over regions being changed at the same time). It is expected that over time there will be enough DVB-T2 receivers sold to switch all DTT transmissions to DVB-T2, and MPEG-4 Part 10. From 27 October 2009, Multiplex B (PSB3) was cleared of SD channels in post DSO areas, which were moved to Multiplex 1 (PSB1). In pre DSO areas, Multiplex B continued to carry BBC Four, BBC Parliament, CBeebies, BBC Radio Stations and 301 until DSO. Former streams of 302 and News Multiscreen on Multiplex B were sublet to broadcasters other than the BBC for pre DSO areas only, and were not available at all in post DSO areas because of the new DVB-T2 HD multiplex as replacement. On 3 April 2008, Ofcom published its final decision for the HDTV transmission format: DVB-T2 and MPEG-4. Initially there were to be three HD services available: BBC HD, ITV HD/STV HD and Channel 4 HD/S4C Clirlun. Channel 5 HD was due to launch during 2010 but was unable to reach 'key criteria' to keep its slot. Spare allocation on multiplex B was handed over to the BBC, two years to the date when it was anticipated that further capacity on multiplex B would revert to the control of the BBC Trust. On 3 November 2010, BBC One HD launched on Freeview HD. It is available in addition to the existing BBC HD channel. During 2011, Ofcom gave the Commercial Public Service Broadcasters another opportunity to apply to provide an additional HD service from 2012. List of digital terrestrial channels Multiplexing The multiplexes In 2014, Ofcom decided to reallocate the frequency band used by COM7 and COM8 to make it available for mobile communications. This project, known as "700Mhz clearance", was intended to be complete by the second quarter of 2020; the switch-off is largely complete but the remaining transmitter changes are postponed due to the COVID-19 pandemic. Channels broadcast on the COM8 multiplex were cleared by Arqiva on 22 June 2020, with some services moving to broadcast from COM7 or PSB3. Use of multiplexing technology Each multiplex is an error-protected bitstream of 24, 27 or 40 megabits per second, which can be used for almost any combination of digitally-encoded video, audio and data. The DVB-T standard provides a multiplex service that can make trade-offs between the number of services and the picture and