Sotheby’s have announced that William S. Sheridan, Executive Vice President and Chief Financial Officer, is leaving the company after 17 years.

Stanley Gibbons was set to raise £40m in a share placing on September 25 to part-fund the deal, which would see them taking control of Baldwin's, Apex, Dreweatts and Bloomsbury, together specialists in coins, stamps, medals, books, fine art and other collecting disciplines.