Certificates are not handed out at the ceremonies. Due to the volume to be printed and checked, they are posted to your home address within four months of the Course Assessment Board which awarded your degree; however, they are usually issued ahead of this schedule. International students will be contacted in advance to confirm their address details or to arrange for collection. If you have not received your certificate after four months you should email email@example.com including your name and student number, who will be happy to investigate further.
For full details, please see http://www.hud.ac.uk/registry/certificatesanddiplomasupplements/certificates/