Speaking of routemasters - stumbled across this that is quite interesting. PB (capped as bread 23 has dropped off) an anon noticed that Q784 has NSA_Traf_CAM_LONDON2847.png for the pic file name. Anon also noted that 2847 refers to COMMS repairs.
This might be nothing, but as one of our pics features ROUTEMASTER buses I thought I would drop it in.
ROUTEMASTER - Server/router for VoIP and audio traffic.
So there is the 2847 ref to COMMS repairs and now the ROUTEMASTER ref to VOIP/audio. Although the pages seem to indicate it is related to drones it doesn't seem unfeasible that it could also be deployed in other ways.
https://www.electrospaces.net/p/nicknames-and-codewords.html
https://s3.amazonaws.com/s3.documentcloud.org/documents/1944698/complex-architecture-of-the-u-s-drone-program.pdf