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UKTV
UK Arena - focused on arts programming. Closed in 2000 due to insufficient ratings, relaunched — originally with the same graphics — as UK Drama, see above
Play UK (formerly UK Play) — closed in 2002 due to low ratings because of the closure of ITV Digital
UK Gold 2 (formerly UK Gold Classics) - closed in 2003, became UKG2 (later UKTV G2 and then Dave)
UK Horizons - closed in 2004 to create UKTV People and UKTV Documentary
UKTV People +1 - closed in 2006 to create UKTV Drama +1
UKTV Bright Ideas - closed in 2007 on all platforms for the relaunch of UKTV G2/Dave going onto Freeview
UK Horizons and UK Arena were named after the BBC's flagship science and arts documentaries, Horizon and Arena.
Note that there was a channel called UK Living that was originally affiliated with UK Gold but did not become part of the UKTV network, it changed its name to LivingTV before the UKTV network launched.