The current listing of "Just Good Friends(TV-series)" R2 UK-DVD (released by Eureka) is missing some important information concerning some music censorship.
According to WIKI https://en.wikipedia.org/wiki/Just_Good ... D_releases + many Amazon.co.uk reviews, The Christmas-Special episode has a portion of the episode edited - removing (possibly substituting) some background music playing. Also the original character dialogue I think is muted during that scene and subtitled instead.
There are x3 series of this title (all of which are listed on DVDCOMPARE) but I'm not quite sure where the Christmas-Special episode fits / in which volume it was released on the Eureka-R2 UK-DVD (Amazon reviews suggest it is included on DVD at the beginning of series3).