03 Jul 2008 | Sam Howroyd WPP Makes Fourth TNS Bid TNS has rejected a third bid from WPP Group valuing the market research company at almost £1.1 billion.TNS, which has already agreed a nil-premium merger with GfK (see TNS And GfK Agree MergerTNS And GfK Agree MergerTNS And GfK Agree MergerTNS And GfK Agree MergerTNS And GfK Agree MergerTNS And GfK Agree Merger www.wpp.com