From the Snowden Files

For several years, British human rights campaigners and lawmakers have been pressuring the government to provide information about whether it has had any role aiding U.S. targeted killing operations, yet they have been met with silence. In particular, there has been an attempt to establish whether the U.K. has aided U.S. drone bombings outside of declared war zones — in countries including Yemen, Pakistan, and Somalia — which have resulted in the deaths of hundreds of civilians and are in some cases considered by United Nations officials to possibly constitute war crimes and violations of international law.

Though the Snowden documents analyzed by The Intercept state that Menwith Hill has aided “a significant number” of “capture-kill” operations, they do not reveal specific details about all of the incidents that resulted in fatalities. What is clear, however, is that the base has targeted countries such as Yemen, Pakistan, and Somalia as part of location-tracking programs like GHOSTHUNTER and GHOSTWOLF — which were created to help pinpoint individuals so they could be captured or killed — suggesting it has played a part in drone strikes in these countries.

[...]

“If the U.K. government knows that it is transferring data that may be used for drone strikes against non-combatants … that transfer is probably unlawful,” Stratford told the members of Parliament. “An individual involved in passing that information is likely to be an accessory to murder.”

  The Intercept

Which may be why there are only a few British citizens in the compound. The majority are Americans, whose own lawless government absolves them of any international or moral responsibility.

Read about it here.

...but hey, do what you want...you will anyway.