Onouha scored the only goal of the game two minutes from time to give City the points although Blues had chances before his goal - Stern John going close twice in the first half.
Blues: Vaesen, Kenna, Painter, Hall, Purse, Sadler, Kirovski, Sheppard, Morrison, John, Motteram. Subs: Doyle, Howland, Barrowman, Till, Courtney.
Man City: Ellegaard, Flood, Jordan, Wiekens, McCarthy, Onouha, Shuker, D’Laryea, Macken, Bradley Wright Phillips, Tandy. Subs: D’Laryea, Mathewson, Murphy, Ireland, Bermingham.