Expo maintains a big top camp first aid kit for plateau injuries and minor caving damage. It is not designed/intended to go underground. Plateau falls are actually the biggest risk on expo - the limestone is sharp and sometimes slippery, the rucksacks are enormous and heavy. Small personal kits for underground use are also a good idea, as is a bivi bag or bothy in case of getting stuck for any reason (as it's damn cold).
There is a rescue grab bag containing underground 1st aid stuff and brew kit/shelter.
At base camp is more first aid stuff for both replenishment and other injuries.