A minority shareholder of International Power Plc (IPR) wants GDF Suez SA (GSZ) to make a better offer for the London-based utility, the Sunday Times reported, without saying how it obtained the information.

GDF bid 390 pence ($6.24) a share for the 30 percent of International Power it doesn’t already own, and Neil Woodford, a fund manager at Invesco Perpetual, wants a minimum of 400 pence a share, the newspaper reported. Invesco Perpetual holds a stake of about 3.3 percent in International Power, the newspaper said.

To contact the reporter on this story: Ben Martin in London at bmartin38@bloomberg.net

To contact the editor responsible for this story: Paul Armstrong at Parmstrong10@bloomberg.net