Who is Captain Peter Y'ang-Yeovil, Angelo Poggi from The Stars My Destination and what is their importance?

Captain Peter Y'ang-Yeovil (Angelo Poggi) is a member of Central Intelligence for the Inner Planets. He is trying to track down Foyle in order to learn more about the destruction of the Nomad. At one point, he assumes the identity of Angelo Poggi to trap Foyle on the Spanish Stairs, when he realizes the man is tracking down crew members of the Vorga. Y'ang-Yeovil opposes the Presteign and Dagenham. He and Robin Wednesbury form an attachment, which suggests a future marriage.