The power snack that is high in carbohydrates, rich in micro nutrients, and low in fat.
Normally sold in bike shops for 99p each, but available here in multiples of 5, 10, 20 or the money saving 30 bar bulk buy. If you haven't tried these before you'll probably want the convenient 5 pack to begin with, but if you know which flavour you like, or are buying for a club or group of riders a bigger pack might make more sense.

Flavours:  

Apple and Blackcurrant
Chocolate and Orange
Chewy Banana
Cherry and Vanilla
Tropical