 WPP PLC hiked its shareholder returns and full-year guidance as it swung back to profit after a stronger than expected second quarter. The FTSE 100 advertising and marketing group said the market recovery in the first half of 2021 has been much faster than expected, with its GroupM division making a big improvement to its forecasts for the year, with global advertising growth of 19 predicted for the year after the 6 decline in 2020. 