BBC2 (first era)
The launch of the channel was delayed by a day by an infamous power failure in Central London.
The first official colour channel in the UK (and in Europe) launched on UHF in 1967, and with it came a brand new ident.
In 1979, BBC2 launches the first ever fully computer generated ident in the world, let alone the UK.
BBC Two (first era)
BBC2 (second era)
As part of an extensive rebrand to cast off BBC2's 'highbrow' tone, Lambie-Nairn launched a brand new set of idents which lasted 10 and a half years until they were replaced in 2001. For the first time a corporate logo scheme featuring the 1988 BBC logo was employed across all of the BBC's services.
The rebrand did work, and although the programming was exactly the same as before, the perception of BBC2 by the public shifted from 'highbrow' and 'stuffy' to cool and trendy.
BBC Two (second era)
On October 4, 1997, BBC Two got a new look, also created by Lambie-Nairn.
In November 2001, the logo was boxed. The idents were changed for the first time in 10 and a half years; the logo stayed the same, but it was given a pair of arms and a personality. The BBC added to the roster of 4 idents over the years.
A new logo of the arrived on February 18, 2007. The typography has changed from Gill Sans to Avenir and the box has changed its colour from purple to teal. The blade '2' has been slightly altered, it is now more squat than before.
The boxless variant of the 2007 BBC Two logo has been used on the revived 1991 idents in Northern Ireland from 1 January 2015.
On 27 September 2018, BBC Two launched a new look, uses the boxless 2007 logo and ditched its famous "2" icon that has been in use since 1991. This box logo from 2007 is currently used as a primary logo. The "2" symbol resembles a curved wave.