How much do things cost in Barcelona and Cardiff? Cardiff is 25% more expensive than Barcelona Cardiff Barcelona Coke/Pepsi (0.33 litre)£1.01£1.29 Bottle of beer (imported beer)£2.74£0.93 Imported beer (0.33 litre)£3.00£2.37 Large bottle of water£0.96£0.43 Last updated on 21/07/2014 source