In 1988, Granada decided to acquire the Nick at Nite block from Viacom. From 1985-2002, Nick at Nite aired after Nickelodeon. This was their logo used in 1989, a year they acquired the block. It lasted for only a few months.
1999-2001: After a few months, ITV decided to bring back the classic Nick at Nite logo (when it was still owned by Viacom). It was slightly modified in 1992 and in 1999, they added ITV's logo at the bottom of the logo with the new "Hearts" ident package, contrary to ITV being at the top and Nick at Night at the bottom.
2001-02: By 2001, ITV was expanding, so Nick at Nite's ident was modified to have the ITV1 logo.
2002-03: ITV decided to retire the Nick at Nite logo in 2002, and switch to a text-only version as part of the switch to the evil and horrid "Celebrities" package.
Even though the logo was retired on idents after 2002, programs produced by Nick at Nite were still using the old 1992 logo, but also with Granada "G-Arrow" logos and the Granada name. This lasted until February 2004. Could this mean that Nick at Nite as a name was to disappear completely?
2003-04: The logo was taken away. They just used the N@N name, which was sad. However, the worst was yet to come.
2004-06: Oh, they still used the name. But it's still not there yet...
In February 2004, the Granada and Carlton group companies finally merged to form ITV plc. So that Nick at Nite was here.
2005: However, they did use the ITV50 logo in the year 2005 to celebrate ITV's 50th anniversary year.
2006: We're almost there. The Emotions set of idents were the last with the name.
Now, the Nick at Nite name was no more into ITV Productions.
2006-10: That was it. No more name, ever. How sad. I am sorry for Nick and Nick@Nite. No sign of a "Nick at Nite" title anywhere on the new batch of ITV idents, however it is name checked in the voiceover.
2010-13: Same as before.
2013-present: Same as before.