Enid Blyton's Enchanted Lands S01 E08 The Land of Know-Alls

The Land of Know-Alls. Something dreadful is happening, the Faraway Tree is dying. The cause of this catastrophe is a bunch of bullying trolls who are mining for jewels in the Tree's roots. No one knows what to do so they decide to visit the Land of Know-Alls and seek the advice of The Great Know-All. If anyone does know what to do it's a Know-All.