“It's delightful, it's delicious, it's de-lovely.” High Society is a dazzling, effervescent summer entertainment, brimming with glamour, wit and charm. Buoyed by Cole Porter's sublime score and a frothy romantic comedy plot adapted from The Philadelphia Story , this is a production that asks nothing of its audience except that they surrender to its considerable pleasures. Sit back and enjoy the glorious music, slick choreography and a steady stream of sparkling comic moments. There may be faint echoes of A Midsummer Night's Dream in its tangle of misplaced affections, but analysing this theatrical soufflé would rather miss the point. Its purpose is simple: to delight. We know from the outset that socialite Tracy Lord, played with engaging assurance by understudy Isabel Snaas on this occasion, will ultimately reunite with her reformed ex-husband Dexter Haven, portrayed with effortless sophistication by Julian Ovenden. Nor does the plot leave much doubt that Freddie...