Mr Crockett delivers a lawnmower to Winkstead Hall, having just rebuilt the engine, and "sharpened her up". Lord Belborough starts the mower, which was still in gear, and it runs off and demolishes the garden wall and door. Lord Belborough phones Mr Clutterbuck the builder and asks him if he can rebuild the wall before the weekend, but Mr Clutterbuck is still awaiting delivery of a load of bricks, which are stuck at Treddles Wharf. Lord Belborough and Brackett steam of to the wharf in Bessie and collect the bricks. Bricklayers Cyril and Horrace are then able to rebuild the wall, while Chippy Minton and Nibbs make a new door. Mr Crockett repairs the mower, "using several completely new parts" and everything is ready in time for the six o'clock dance.