Towser and the Water Rats is the fourth episode.
Towser is relaxing one summer day at his summerhouse when a little steamer owned by the Water Rats Shipping company. They want to buy Towser's summerhouse and they pay Towser 4 pence for it. Towser wants one ride in their boat and takes all his belongings from the summerhouse and puts it on the boat. Towser then buy back the house for 2 pences (because its worth no more). Towser then states how glad he is that the water rats changed their minds, considering his dislike for boats.