The mystery bidder for CAP Group Plc should show his hand today, although its possible a cloak of nominee names will still hide the true identity – and he is at liberty to bid for another 4m shares, taking his stake to 25%: if, as we suggested Monday, it’s not Cap Gemini Sogeti, there are few other pure software and services plays with the muscle to make such a move, and the spotlight turns on the likes of Olivetti or Bull – or even Daimler-Benz or Messerschmidt.