British Crown Jewels
From Tardis Wiki, the free Doctor Who reference
The British Crown Jewels were part of the ceremonial regalia of English monarchy. They were kept in the Tower of London. (COMIC: Secret of the Tower)
In the 1970s, Yates of the UNIT said that getting a hold of the suspicious waste from the Global Chemicals would be have been "like stealing the Crown Jewels". (TV: The Green Death)
