Earlier quoted context omitted.
Reminds me of a story about an allied sabateur working in occupied France during WWII. They were trying to convince someone that they were indeed the "real deal" and nothing was working until they agreed on a coded phrase to be played on the BBC radio. Only after hearing the message on the radio the next night was their identity trusted.
I would find it unlikely that a low level guy would have the connections to slip a phrase into the BBC and would think they have to be a spy with high level connections.
He didn't corrupt the BBC announcers, they just both worked for the government.