David Tennant's 10th Doctor introduced the Shadow Proclamation as the "Outer Space Police" when he and Martha were hiding from the Judoon in Doctor Who season 3 episode 1 “Smith and Jones”, and the latest episode of Doctor Who: Flux referenced them once again. Audiences haven't heard much about the Space Police since Tennant departed, but the Shadow Proclamation was reintroduced in the latest series' second episode, "War of the Sontarans," showing that the Proclamation is still active. In Flux episode 2, Jodie Whittaker’s 13th Doctor tried desperately to stop the British from fighting against the Sontarans. The episode took place during what was meant to be the Crimean War. However, the British troops weren’t fighting against Russia; they were fighting against the Sontarans.
Doctor Who was rebooted in March of 2005 with Christopher Eccleston's Ninth Doctor and has been popular ever since. The series is now on the 13th Doctor, and Whittaker is the first woman to play the part. The show introduced its second female Doctor as The Fugitive Doctor (Jo Martin.) Martin is also the first person of color to play the character. Doctor Who is the longest-running science fiction TV show in history. Its original run lasted a whopping 26 seasons, playing from 1963-1989. The show was revived in 2005 and is still going strong.
The Shadow Proclamation used the Judoon as their police force. The 10th Doctor, which was one of Tennant’s best roles, continued to reference the Shadow Proclamation throughout his 3 seasons. He invoked the Shadow Proclamation in season in season 2's "Fear Her” and multiple times during season 4. The Shadow Proclamation is addressed in season 4 episode 1 "Partners in Crime," season 4 episode 2 "The Fires of Pompeii,” and in season 4 episode 12 "The Stolen Earth.” In Doctor Who: Flux episode 2, the Shadow Proclamation was brought up for the first time in years when an injured Sontaran mentioned it.
Only a few regulations and treaties of the Shadow Proclamation have been revealed (a majority of which were revealed in Doctor Who novels, not the show itself), and most of the references to the Shadow Proclamation were made in the Doctor Who comics. Article 15 stated that murder was not a rule of war. Convention 15, addressed ceasing hostile activities to parley. Article 27 allowed beings to demand recording equipment; 29.8 banned Gelem warriors; 57 forbade the destruction of level 5 planets unless a law was broken; Clause 374 stated that lethal force could be used to recover culturally significant artifacts.
Even though the Shadow Proclamation is primarily referenced in the comics, the show has brought it up a handful of times both before and after the 10th Doctor. The ninth Doctor addressed the Shadow Proclamation in "Rose," the first episode of Doctor Who season 1, and Rose referenced Article 15 when she threatened the leader of the Sycorax in "The Christmas Invasion," the show's first Christmas special. While it has been a while since viewers heard about Tennant's Space Police, the comment made by the Sontaran in episode 2 of Flux was not the first time the Shadow Proclamation was referenced since Tennant.
The 10th Doctor’s seasons may have referenced the Shadow Proclamation the most often, but they weren’t the last seasons to do so. The 11th Doctor invoked the Shadow Proclamation in "The Eleventh Hour," and the 12th Doctor dealt with the Proclamation in season 9 episode 1 "The Magicians Apprentice." While viewers haven't heard from the Proclamation in the years since then, it did show that the Shadow Proclamation was in effect throughout the time since Tennant starred in Doctor Who, and Flux episode 2 further confirmed this.