Forerunner, Herald
This page is the CodyCross answer for the clue below from London, Group 498, Puzzle 1 (Black Taxi Cabs).
Question is: Forerunner, Herald
and the answer is: HARBINGER
Word Meaning:
HARBINGER — A person or thing that foreshadows or foretells the coming of someone or something.
Definitions from Wiktionary.