Cliff Michelmore introduces the last of three programmes.

Dick Tracey sends an all-action report from Paris on a British bid to win the Seine six-hour power boat race, fastest event of its kind in the world.
On a winter's day Bob Fisher goes dinghy racing off the South Coast to find out what attracts so many men - and women - to this freezing weekend sport.
And at the London Corinthian Sailing Club, yachtsmen reply to the crew of a Cornish lifeboat who claim they have to put to sea too often to rescue reckless amateur sailors.