Possible Clues:

• Member of Oliver's house party?
• One of those in the house synonymous with a diet?
• Eg, an MP
• One sitting in normal section of joint not good with an air that's suspect
• Old man seen going to an air terminal, doddery politician
• Animal trainer travelling from Pennsylvania to become a legislator
• Houseman perhaps
• Blair's one MP with an alert air in a disaster
• A commoner
• A rant associated originally with an imperial legislator