Paul Critchley is the Leader of the Conservative Party and the Leader of the Opposition to Ros's Government. He holds a bitter grudge against Catherine, his former lover, who in his eyes betrayed him and his party by defecting to Ros. Critchley's skill as a parliamentary debater, and his ruthless willingness to throw a politically inconvenient colleague overboard, epitomise the peak of traditional politics, and contrast with the spontaneous, idealistic—if at times naive—approach embodied by Ros, at least in the earlier episodes before political life starts to harden her.