In issue 1510 of "the Galaxy's Greatest Comic" (2000AD) "Judge Fargo" was wearing the No. 42 shirt in a game of American football, which Dredd et al are watching a recording of, in the Origins story line.
When the Lloyd's building was relaunched as "tower 42" they had a huge 42 on the top of the building (this was in 2001 IIRC).
The Kumar's at no. 42 - well known "chat show".
As time goes by, I'll try <winkeye> to keep the page updated with verified sightings... (i.e. documented, or verified by another researcher). I WILL add the first 42 verified spottings to this page...