British pop star Robbie Williams has stepped up his war with former manager NIGEL MARTIN-SMITH by slamming him from the stage during a concert. The ANGELS singer is currently involved in a feud with his ex Take That boss over a song on his new album, which lawyers believe could be libellous. In outspoken track THE 90s, Williams reveals he fantasised about hurting the pop mogul during his time with the chart-topping boy band. Martin-Smith has demanded the song be removed from William's new album RUDEBOX. But defiant Williams sang the words in front of 65,000 fans at the Milton Keynes Bowl in England on Thursday (14SEP06).