D epending on how you look at it, drag ballet troupe the Trocks offer either lighthearted camp, an in-joke for dance megafans, or an existential question about the very nature of ballet and beauty. Les Ballets Trockadero de Monte Carlo , to give the company its formal mouthful of a name, has been going since 1974 , five decades in which the perception of drag, and of gender, has transformed. The 14-strong all-male company (or gender-skewering, they now usually say) dresses in tutus, pointe shoes and greasepaint, dancing mainly extracts from the classical ballet repertoire: Swan Lake, Paquita, etc. Danced with love and knowledge … Robert Carter in The Dying Swan by Les Ballets Trockadero de Monte Carlo. Photograph: Tristram Kenton/the Guardian They do it in a way that mixes slapstick comedy, hammed up to the hilt, with a deep love and knowledge of the art form.…