Zach, a blue monarch butterfly, and all of his insect freinds, host a show where they aim to visit every single London borough, all 32 of them, they gather their research on the boroughs, and explain to viewers what's so special about the boroughs, what transport links they have, what landmarks they have, and if anything else is worthy enough of being told to the viewers. The show encourages people to visit London, and go explore the incredibly convoluted capital city themselves.