Aveline
Come come LadyHonoria he's not nouveau riche!
His parents made their fortune from franchising stuffed Paddington Bears. They made enough from that to send young Jeremy to Repton College, where he was bullied for his uncultivated ways. He's certainly not from old money.
Of course he then goes on to bully his BBC producer, breaking his nose in a tantrum because he and his mates had stayed in the pub until chucking-out time and returned to their hotel long after the kitchen staff had gone home, and there was only a cold buffet instead of a proper manly steak.
He's definitely not a man of any kind of class.