Andrew Manze conducts the BBC National Orchestra of Wales in a Prom with an atmospheric nautical theme.Doreen Carwithen's powerful and vivid overture depicts the harsh, cold Atlantic waters battering Bishop Rock, 30 miles off Land's End. Its lighthouse is a seafarer's last sighting of terra firma as they head west.Grace Williams's Sea Sketches, inspired by her home town of Barry in south Wales, capture the sea's effervescent personality.Vaughan Williams's majestic A Sea Symphony, featuring multiple choirs together with soloists Elizabeth Llewellyn and Andrew Foster-Williams, rounds off the evening.Georgia Mann presents alongside special guests.