Frederick Ashton’s Daphnis and Chloë, the first ballet in this seasonal double bill, is a pastoral Greek reverie spiced up by kidnap, bondage, gauze-draped nymphs, near-rape and a (consensual) leg-twanging orgasm experienced by Ambra Vallo’s bad girl, Lykanion, much to the surprise of Iain Mackay’s hero Daphnis, who induces it.