COMPANY director Nick Whitlam calls it the Illawarra Riviera. He's describing the stretch of land hugging the coast south of Sydney from Thirroul up to Stanwell Park, taking in the scenic suburbs of Thirroul, Austinmer, Coledale and Scarborough. Whitlam, the son of Gough and a former merchant banker, relocated to the Illawarra from the inner-Sydney suburb of Paddington a decade ago and is putting the finishing touches to a new house on a tiny headland at seaside Scarborough designed by architect Keith Cottier, who owns a holiday house in the region. Along with Whitlam, the Illawarra sports a host of entertainment celebrities.