Ed and Oucho's Excellent Inventions - Series 2 - Davenportanator

Children's science series in which Ed and his cactus companion Oucho travel all over the country making inventions from bits of old rubbish that they find in the back of their van. Ed and Oucho need to find out about radio waves if they want to win Carl Trouser's quiz. So they build Hemang's Davenportanator, a remote control spider that zooms around the London streets, shouting and squirting water, to help them on their mission. It starts off well, but a mix-up with frequency means Major Cake needs to send his frequency testing machine, which ends up a trifle messy! Will Ed and Oucho make the Davenportanator and win the prize they are after?