Whilst this thread is active - if anyone's interested in Big Brother title sequences, I found these recently.
First, the Big Brother 5 titles in widescreen, unlike originally broadcast as the show was 4:3 until 2006. It also has the Big Brother name at the end, presumably it was only at the last minute they decided the logo was so well known they didn't need to show the name on screen anymore:
And on this page, the Big Brother 7-11 titles in HD, including series 6 which, again, was originally shown in 4:3 as the last series before the widescreen upgrade. (And obviously none of them were originally broadcast in HD).