Ian is Paul's half-brother on his mother's side. He is first introduced in Season 3: Episode 2 The Sister in Law when Paul takes him to Becky and Steve's flat to meet them.
Ian is polite and well-spoken. He seems somewhat ashamed of Paul and constantly reminds everyone that they are only half-brothers. Paul does not seem to take the hint that he makes Ian uncomfortable, however Ian is too polite to say so.
Ian was an usher at Paul and Laura's wedding along with Paul's friend Keith from Rymans. Paul and Keith had very little in common and did not appear to get on.
He is played by Jonny Sweet. Two fellow Inbetweener co-stars joined him in series 4, Robin Weaver and Victoria Willing.