Gfk says no certainty about bid for TNS

German market research firm Gfk nows says there is no certainty that it will launch a bid to rival WPP Group for TNS. Yesterday, Gfk terminated its proposed nil-premium merger with TNS and said it was "actively pursuing a proposal" that would involve an alternative all-cash offer being made for the British firm.Gfk said yesterday: "While negotiations are at an early stage, GfK has received a strong indication of interest in this transaction. The form of consideration being considered is all cash, although the formal right to vary this is reserved."