1x3 - Contraption Masters

Three amateur British pilots take on the American team Wildcards in challenge to build a chain reaction machine that'll allow Richard to feed his dog without leaving his sun lounger in the garden. With a spot in the semi-finals at stake, the rival teams let their imaginations run wild - even employing a little espionage on each other's work in a bid to pull ahead, but will this tactic impress judge Zach?