1. They used the same state emblems to create a completely different design.
2. Doesn't mean other people can use their "old" logo (which they're currently still using).
FWIW, I'm no fan of MOS (one of the reasons I posted is because they're notoriously litigious, even suing Spotify over the order of user playlists), but I'm also no fan of design work being so blatantly ripped off, particularly by companies that can easily afford to hand work to a real designer.
1) The Ministry of Sound logo is imitation of an official government ministry logo anyway, eg https://www.gov.uk/government/organisations/the-office-of-th... or https://www.gov.uk/government/organisations
2) The Ministry of Sound changed their logo: http://www.underconsideration.com/brandnew/archives/new_logo...