There are four major forms of digital television (DTV) broadcast in the United Kingdom: a direct-to-home satellite service from the Astra 28.2°E satellites provided by Sky UK, a cable television service provided by Virgin Media (known as Virgin TV); a free-to-air satellite service called Freesat; and a free-to-air digital terrestrial service called Freeview. In addition, an IPTV system known as BT TV is provided by BT. Individual access methods vary throughout the country. 77% of the United Kingdom has access to HDTV via terrestrial digital television. Satellite is the only source of HDTV broadcast available for the remaining 23%.
Major forms of broadcast DTV
Terrestrial
The initial attempt at launching a digital terrestrial broadcasting service, ONdigital (later called ITV Digital), was unsuccessful and the company went into liquidation. Some observers have argued that this failure stemmed from the Government's eagerness in having sold off too much TV spectrum to launch Channel 5 (the last UK terrestrial analogue channel), and ONdigital's short-sightedness in over-extending its use of available bandwidth: using poor signal encoding to maintain compatibility with early set-top boxes, optimising their broadcasts for capacity rather than reliability, and cramming too many channels into the available bandwidth.
ITV Digital was replaced in late 2002 by Freeview, which uses the same DVB-T technology, but with higher levels of error correction and more robust (but lower-capacity) modulation on the "Public Service" multiplexes in an attempt to counter the reception problems which dogged its predecessor. Rather than concentrating on Pay TV services, Freeview uses the available capacity to provide a free-to-air service that includes all the existing five free-to-air analogue terrestrial channels and about twenty new digital channels. All services are transmitted in standard definition—576i in the UK—many using an anamorphic widescreen format.
31 March 2004 saw the return of a limited pay-television offering to the digital terrestrial platform with the launch of Top Up TV. This new service is designed to appeal to those who do not want to pay the higher subscription fees that Sky Television and the Cable networks demanded. The service carries some of the UK's most watched channels including the Discovery Channel, UKTV Gold, Discovery Real Time, British Eurosport and Cartoon Network. The 10 channels are split into five different slots and broadcast for only part of the day. In October 2006, Top Up TV became Top Up TV Anytime, taking advantage of the increase in the popularity of PVRs, and its limited channel space. Now over 100 programs are broadcast overnight and added to the box's hard disk, so that it may be watched at any time. Channels that joined the service include MTV, Nickelodeon and Hallmark Channel.
2005 saw the first areas of the United Kingdom losing their analogue signal in a pilot test. The residents of Ferryside and Llansteffan in Carmarthenshire, Wales who had not already upgraded to digital television were given a free set-top box to receive the Freeview television service, which includes Channel 4 (previously unavailable terrestrially from transmitters in Wales) and S4C~2, which broadcasts sessions of the National Assembly for Wales. Digital transmissions for this pilot commenced in December 2004, at which time a message was added to the analogue picture advising viewers that the analogue services would end in February 2005. The pilot paved the way for full switch-over to digital television signals throughout the United Kingdom by the Government's deadline of 2012.
The year 2005 also saw the announcement by Ofcom of the proposed analogue switch off plans for the UK. It is proposed that the switch off will progress on an ITV region by region basis starting in 2008 starting in the Border Television region and ending in the Channel Television region in 2012. The coverage of the three public service multiplexes will be the same as that enjoyed by the current analogue TV stations, while the three commercial multiplexes will cover approximately 90% of the UK population. To improve long standing interference issues in the Meridian and Anglia franchise areas a small number of new transmitters will be brought into service when those regions are converted in 2010 and 2011. These plans were confirmed by the Secretary of State for Culture, Tessa Jowell, on 15 September 2005. .
See Digital switchover in the United Kingdom.