This has been shared on Facebook last the few days. However encase anyone's not seen it who's interested posting here. Video provides an interesting history of the GBR sailing team at 1972 Olympics and the various class pre-selection events. It features Alan Warren amongst others. 
Love the sailing kits and the singing narration! Hasn't dated at all, lol
 
https://player.bfi.org.uk/free/film/watch-appointment-at-kiel-1973-online