How much do things cost in Barcelona and London? London Barcelona One-way ticket (local transport)£2.80£1.65 Bottle of beer (imported beer)£1.51£0.96 Small bottle of water (0.33 litre)£0.95£1.08 1 litre of milk£0.94£0.73 Bottle of local beer (0.5 litre)£1.53£0.65 Last updated on 15/04/2014 source