The move means that EMI Music UK senior vice president Mark Collen, who oversees the Angel label, and Terry Felgate, managing director of EMI Records, will be changing roles. They are currently considering other senior roles.
All EMI imprints will remain active, but the four frontline A&R teams will merge into two, headed by Leonard and Unger Hamilton.
A source says that the decision is driven by "the cost effectiveness of A&R".
"You have got four frontline A&R teams going into two but backed by the two strongest A&R guys," the source adds.
The major's other London based A&R teams - EMI Classics and Mute - as well as joint ventures Relentless, Heavenly and DFA - will operate as before, with the exception that Mute's A&R team will report into Nick Gatfield when he joins the major.