Birmingham made the better start, racing into a 5-1 lead by the beginning of the second period with goals by Ben Cartwright (2), Matt Foulds (2) and Jason Culloo.
Photo by Trevor Hyde: Barac scores one of his goals against Birmingham.
Southampton made sure of a top five place and progress to Championship 2 with a 9-6 success against Otter. They were joined later by Hucknall, who followed up a 12-10 defeat of York City with a 8-6 victory over bottom team University of Bristol.