Del accompanies Rodney to an organic health food shop owned by a wealthy gardening enthusiast named Myles.
When he sees the high price of the store's produce, Del develops an interest in gardening and invites Myles to the allotment to advise him on growing vegetables.
However, unsighted by Myles, Rodney notices that the "spring water" is actually coming from a nearby tap connected to a hose and concealed by rocks.
In the final scene, as the Trotter family go to sleep in their hotel rooms, the BBC News reports that Peckham is without water after a local reservoir has been contaminated by the barrels dumped by Del, Denzil, and Trigger.
As a blissfully unaware Del switches off the light, a bottle of Peckham Spring on his bedside table glows yellow, indicating that he has been giving the barrels' contents to his customers.