The UK theme song - written by Michael Carr and Ben Nisbet and later back dubbed onto all versions, was simply titled "White Horses", and credited to "Jacky" - was sung by Irish-born Jackie Lee. It became a top 10 hit in the UK charts in April 1968. The book The Penguin Television Companion claimed it to be the best television theme in history. It has been copied and used many times since, including:
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