So the February warning is related. Was the car attack warning about a false flag designed to distract the city while someone attempted to penetrate the London CIA office and get the incriminating LP/Strzok evidence of FVEY spying?
The actual phrase is "when does the caged bird sing." Ergo the bird sings when it is caged. Q is reminding LP that she is caged. If she was in London with PS coordinating the FVEY spying then she is in deep legal shit. That's a legit espionage charge because she was acting on behalf of a foreign power. Welcome to life in prison.