Chris Serle picks choice moments of television's past. This week Chris takes a look at Journeys - and travels through man-eating rapids in River Journeys, on the QE2 with Alan Whicker, out in space with The Clangers, back in time with Morecambe and Wise, and into the future with Tripods. Special guest is writer, Monty Python star and train spotter Michael Palin.