SIGNET HQ was the headquarters of SIGNET in York. It was a repurporsed hangar, but was equipped with its own car park and a reception desk.
For Halloween, Olivia, with her characteristic enthusiasm, once draped a strip of bunting with "Happy Halloween!" written on it over the hangar doors. (PROSE: Hervoken Halloween [+]James Hornby, Horrors of Arcbeatle (SIGNET, Arcbeatle Press, 2023).)