Chris and Kate are in the Lake District to witness a British wood at its seasonal best - a colourful and spectacular sight. The trees are host to red squirrels, jays and tawny owls - all very busy at this time of year.
Simon King is in Scotland to follow the fortunes of wild salmon - in autumn they face the daunting task of swimming many miles upriver to breed.
Gordon Buchanan is on the trail of another viewer's story, and Martin Hughes-Games demonstrates how to get more involved with the wildlife and the series.
