UNIT is mentioned by both its acronym and full name in the 2005 series episodes "Aliens of London" and "World War Three", where it sent a delegation to a gathering of experts at 10 Downing Street [REF].
From "The Power of Three" (2012), the first on screen appearance of UNIT in any Whoniverse media since the two-part Doctor Who special The End of Time in 2009-2010, UNIT has been shown to have been reorganised by Kate Stewart, the Brigadier's daughter [REF].