Lyttelton; Theatre Royal Haymarket; Old Vic, LondonLindsay Duncan and co create a living period piece in Dodie Smith's rarely performed marvel of a family portrait; Sarah Snook's one-woman Wilde is so wrong it's almost right; and the music carries a tame Live Aid nostalgiafest Dodie Smith started her career as a successful playwright before the second world war. Dear Octopus was first performed in 1938. She wrote the…