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Robbie returns to where his boating life began, exploring London's canals on Naughty Lass. He travels through Little Venice and moors in Paddington Basin.
Robbie moors by Hampton Court Palace, but disaster strikes when a tree branch smashes a window. His dad joins to help through Hanwell locks.
Robbie mends a leaky pump on the Naughty Lass on the Grand Union Canal. In Watford, he visits a TV legend's home and buys gas from a friendly fuel boat.