You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Martin Agency Only the Latest U.S. Shop to Confront a Tough City: London High Management Turnover Stalls Momentum for Some Agencies By Emma Hall, Published on July 21, 2014 1 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.