Birmingham lost their composure as Kodjia hooked home his second goal in the 66th minute .
Birmingham restored Birmingham 's two - goal advantage when Grounds rose high to head home Cotterill 's left - wing corner in the 77th minute .
Birmingham lost their composure as Kodjia hooked home his second goal in the 66th minute , but they restored their two - goal advantage when Grounds rose high to head home Cotterill 's left - wing corner in the 77th minute .