Matthew Sweet's guests include the grumpy old man of American satire, P.J. O'Rourke; one of the leading practitioners of relational aesthetics, Philippe Parreno; and the architect Rab Bennetts, who has re-designed the Royal Shakespeare Company's home at Stratford-upon-Avon. All three may figure in Matthew's dissection of what it means to be a gentleman -- an inquiry which follows an assertion from none other than Mr Darcy's avatar, the actor Colin Firth, who claims there is no such thing.