Gerard Matthew was Mark's sickly co-worker at JLB Credit, and later, his love rival over Dobby. He had health problems which sometimes resulted in a need for a tube up his nose, and had similar interests to Dobby such as MMORPGs and live action role-play. In Series 7, he and Mark formed 'The Dobby Club,' an organisation of two who are committed to breaking Dobby up with her then-current boyfriend Simon, deciding that the matter of which of them gets to date her if they succeed can be resolved afterwards.

Despite their skin deep friendship, Mark would betray him easily if he stood between him and getting what he wanted. Gerrard died of flu in the first episode of the eighth series.