Big Jim Sullivan (born James George Thompkins, 14th February 1941, in Uxbridge, Middlesex, England; died 2nd October 2012) was an English popular music musician, whose career started in 1959. During his time he was the most prolific session guitarist in the UK, playing on 55 number one UK hit singles. Sullivan was born at Uxbridge Hospital, and he later went to Woodfield Secondary School, in Cranford, London. By 1959, at the the 2I's coffee club, Sullivan met Marty Wilde, and was invited to become a member of his backing group, The Wildcats.

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