JWT, the wholly-owned global marketing communications agency of WPP, has purchased a stake in The Hardy Boys, a creative agency in South Africa. The business is a multi-disciplinary, brand building agency, with fully integrated activation capabilities. Its client list includes Unilever and Diageo. For the year ended February 28th, The Hardy Boys' revenues totalled 55m South African rand, with gross assets at the year-end of around 32.2m. NR