Old Tom - Season 1 Episode 48 Swings and Roundabouts

The local playground is old and dilapidated, so Old Tom and Lucy decide to hold a fundraising fete to build a new one. However, Lavinia takes over the fete and hardly raises any money at all. When Old Tom and Billy get into a tussle over the playground's maypole, they accidentally drill it into the ground, striking a spring of natural mineral water, which soaks Lavinia and ends the fete. But the underground spring turns out to be very valuable and, with the proceeds, a new playground is erected in Old Tom's honor.