Question:  Brain Box was a live, interactive quiz show, showing in Northern Ireland and the Republic of Ireland on which commercial television broadcaster in Northern Ireland owned and operated by ITV plc as part of the ITV Network?

Context paragraphs:
Itv.com: itv.com is the main Web site of ITV plc, the UK's largest commercial television broadcaster which operates 13 out of 15 regions on the ITV network under the ITV brand (or the UTV brand in Northern Ireland).  The website offers online streaming, the ITV archive, news, sport, entertainment, soaps, lifestyle, drama and an interactive TV guide.  Each of ITV plc's channels, ITV, ITV2, ITV3, ITV4, and CITV has a page with information on its programming.  There are also pages for the ITV regions owned by ITV plc.  STV, the only region not owned by ITV plc, have their own separate website at stv.tv.

UTV (TV channel): UTV (formerly Ulster Television) is a commercial television broadcaster in Northern Ireland owned and operated by ITV plc as part of the ITV Network.  Formed in November 1958 and appointed as programme contractor for the Independent Television Authority soon after, UTV became the first indigenous broadcaster in Northern Ireland.

ITV Meridian: ITV Meridian (previously Meridian Broadcasting) is the holder of the ITV franchise for the South East of England and parts of the South West of England.  The station was launched on 1 January 1993, replacing previous broadcaster Television South, and is owned and operated by ITV plc, under the licensee of ITV Broadcasting Limited.  Meridian Broadcasting Ltd was one of several (but not all) ITV plc-owned regional companies to have its legal name changed on 29 December 2006, when it became ITV Meridian Ltd.  This company is, along with most other regional companies owned by ITV plc, listed with Companies House as a "Dormant company".

ITV plc: ITV plc is a British media company based in London, England.  It holds 13 of the 15 regional television licences that make up the ITV network, the oldest and largest commercial terrestrial television network in the United Kingdom.  The network, which is branded ITV by ITV plc, has vied with the British Broadcasting Corporation's BBC One for the status of the UK's most watched channel since the 1950s (a crown it lost in 2005).

ITV Tyne Tees: ITV Tyne Tees, previously known as Tyne Tees, Channel 3 North East and Tyne Tees Television, is the ITV television franchise for North East England and parts of North Yorkshire.  Tyne Tees is owned and operated by ITV plc under the licensee of "ITV Broadcasting Limited".  The analogue signals in the Tyne Tees region were switched off in 2012, making the station, along with ITV London and UTV, one of the last ITV regions to solely broadcast digitally.  Tyne-Tees Television Ltd and Tyne-Tees Television Holdings still legally exist.  Each of these companies is, along with most other regional companies owned by ITV plc, listed at Companies House as a "Dormant company".

Make Your Play: Make Your Play was a live, interactive quiz show, showing in the UK on the ITV Network, from Monday to Saturday, beginning after midnight.  The show was launched on Friday 29 September 2006 on ITV and ITV Play.

Carlton Television: Carlton Television (now part of the non-franchise ITV London region) was the ITV franchise holder for London and the surrounding counties from 9.25am every Monday to 5.15pm every Friday.  The company is now managed with London Weekend Television as a single entity (ITV London), but the two companies are still separately licensed.  The station is owned and operated by ITV plc under the licensee of "ITV Broadcasting Limited".  Carlton has been branded on air as 'ITV1' since 28 October 2002, and as 'ITV' since 14 January 2013.  Carlton legally exists as Carlton Television Ltd.  This company is, along with most other regional companies owned by ITV plc, listed on www.companieshouse.gov.uk as a "Dormant company".  As Carlton's name has no relation to its region, its on-screen identity has been completely removed (along with those of HTV, LWT and GMTV).  Other regions have kept their original company name as a region name and in their local news name.

ITV Digital Channels: ITV Digital Channels Limited (ITVDCL) (formerly known as Granada Sky Broadcasting or GSkyB) is a wholly owned subsidiary of British television broadcaster ITV plc.  ITV Digital Channels Ltd now solely under control of ITV plc is today a profitable business which runs all ITV plc's television channels with the exception of ITV, which is part of the ITV Network.

ITV Channel Television: ITV Channel TV, previously Channel Television, is a British television station which has served as the ITV contractor for the Channel Islands since 1962.  It is based in Jersey and broadcasts regional programme for insertion into the network ITV schedule.  Until November 2011, Channel Television was one of four ITV companies independent from ITV plc alongside the two STV regions in Scotland and UTV in Northern Ireland.  The station has been owned by ITV plc since the licence was transferred to ITV Broadcasting Limited in March 2017.

Brain Box: Brain Box was a live, interactive quiz show, showing in Northern Ireland and the Republic of Ireland on UTV, and in Scotland on STV, airing every night, beginning after midnight.

Supporting paragraphs: Brain Box UTV (TV channel)
Answer: UTV