DRUGS giant GlaxoSmithKline confirmed today that Sir Christopher Gent has been appointed as non-executive chairman. Gent, who was also being considered as a replacement for former Marks & Spencer boss Luc Vandevelde, will join the Glaxo board as deputy chairman on 1 June, prior to the retirement of outgoing chairman Sir Christopher Hogg on December 31. He will take over as chairman on 1 January, 2005.