Department HQ was the headquarters of the Department, located in London. A mobile HQ also existed.

In 2050, Thorne hosted an open house in the hopes of trapping K9. (TV: Lost Library of Ukko)

Later that year, K9 "borrowed" a control cortex so Gryffen could repair Birdie from a storage room in the Department HQ. (TV: Mutant Copper)

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