James Aaron Diamond (28 September 1951 – 8 October 2015) was a Scottish singer-songwriter, best known for his three Top 5 hits. The first was "I Won’t Let You Down" (1982), as the lead singer in the trio PhD, with Tony Hymas and Simon Phillips. His solo performance, "I Should Have Known Better", was a United Kingdom No.1 in 1984. The third track was the theme song from Boon, "Hi Ho Silver" which reached No.5 in the UK Singles Chart in 1986. He has also featured as a vocalist on the charity No.1s "You’ll Never Walk Alone" with The Crowd and "Let It Be" with Ferry Aid. His last UK chart success was with "Young Love (Carry Me Away)" in 1986.