Unit 4 + 2's song "Concrete and Clay" became a big hit the following year, reportedly thanks to exposure on pirate radio stations, most notably Wonderful Radio London. Tony Windsor, the radio station's music director, later recalled in an interview that he initially rejected the song for the station's playlist, but was persuaded to change his mind by DJ Kenny Everett. The song was recorded with session musicians Russ Ballard and Bob Henrit (who had played with the Roulettes). As well as reaching the top of the UK chart, "Concrete and Clay" was popular worldwide. In the United States], a competing cover version by Eddie Rambeau (produced by Bob Crewe) split sales, with Rambeau's reaching No. 35 on the "Billboard" Hot 100 and Unit 4 + 2's peaking at No. 28. "Cashbox" bracketed the two competing versions together on its chart, and they reached a combined peak of No. 12.