I was saddened to hear that Olivia Newton-John had died. Unlike almost everyone else in the world though I flashed back - not to Grease but to "Coming Home" a documentary exploring the story of her Welsh ancestry, that begins in her father’s home town of Cardiff.
It wasn't on the iPlayer yesterday but it is this morning. Available for 29 days at https://www.bbc.co.uk/iplayer/episode/m001bdkz/coming-home-olivia-newton-john. Well worth look.
Facts at random; her maternal grandfather was Max Born, the physics Nobel prize laureate and her father - Brinley Newton-John - was the man who took Rudolf Hess into custody.