When the school's last remaining keyboard blows a fuse, Josh decides to help raise funds for new musical instruments by staging a charity auction. But without any valuables to give to the cause, Josh opts to donate Nathan's stuff instead.

Since Jamie Oliver's push for healthy school meals, sweets have been banned at Elmsbury High. But someone is running an unofficial tuck shop selling crisps and chocolate - and Nathan is given the job of finding out who is behind it.