GR translation: rattling sitreps

[Mike Jing]

P33.33-38   After that first surge of interest, the number of clients
assigned to Pirate tapered off some. At the moment he carries what he
feels is a comfortable case load. But it’s not what he really wants.
They will not understand, the gently bred maniacs of S.O.E. ah very
good, Captain rattling sitreps, shuffling boots, echoes off of
Government eyeglasses jolly good and why not do it actually for us
sometime at the Club. . . .

How are the sitreps "rattling'?  Does it refer to someone talking, or
is it something else?