Re: Speed of light
Yes, Captain Blue had been bashed on the noggin. He could hear the Big Ben whilst he was still groggy, but heard thirteen chimes. They worked out that he was hearing the chimes directly and via a radio and were able to calculate how far he was from the Houses of Parliament.
Of course, that wouldn't work with DAB because of the delays associated with audio compression, interleaving, FEC and variable decoding times in different receivers. Another cherished childhood memory ruined by the relentless march of progress! When was the last time physics was used/referenced in a kids' TV show?
Older viewers will recall the "O"-level Physics question about whether the chap on Westminster Bridge hears the chimes before or after someone in Australia listening to the World Service.