Al pops most of the balloons
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Al begins by looking suspiciously at the washing line of balloons. When Alex questions him, he says “looks like they’re in morse code, 4 dots, 3 dashes, something. I don’t know.” Apparently dismissing this instinct that there is more here than meets the eye, Al decides instead to take his time and collect the balloons together into bags, so he can attack them together in a more confined space. Unfortunately, as he removes the balloons from the line, a helium-filled one immediately floats away. As he searches the shed for something to attack the remaining balloons with, his bags full of balloons blow around on the grass. He eventually opts for a cricket bat, and begins whacking the bags with it. As he does this, another helium balloon floats away. He ends up bursting the remaining balloons through a combination of hitting the bags with the bat, and stomping on them, in 34.6 seconds. He would have earned second place, but is demoted to last because of the two balloons which escaped.
(Written by JoGo and proofread by Karl Craven)