After his success in the United States and with Shirley Bassey, Julien wrote the English lyrics for the 1968 Eurovision Song Contest winning song "La, la, la". Although the Spanish version had the most success, Julien's version reached number seventeen in the Rhodesian charts. The next year, he was invited to write the lyrics for a song for the BBC's national selection process for the 1969 Eurovision Song Contest. His song, "Boom Bang-a-Bang" won the televised competition, and represented the United Kingdom in Madrid. The song placed joint first, with a total of 18 points. It went on to be a hit, peaking at number two in the charts in the UK, in which it remained for 13 weeks. The song also had success in Europe and Australia, in its foreign language versions. He also wrote "Nine Times Out Of Ten" for Ireland's 1969 entrant Muriel Day who performed "The Wages of Love".