The dreamy pastoralism of Vaughan Williams’s The Lark Ascending contrasts with the jaunty vigour of the composer’s overture The Wasps in this all-English Prom. Job continues this season’s thread of great 20th-century ballet scores, while William Alwyn’s First Symphony adds to the evening’s nostalgia with the endless melody of its slow movement. Janine Jansen joins Sakari Oramo and the BBC Symphony Orchestra as soloist.