How much do things cost in Warsaw and London? London Warsaw Large bottle of water£1.00£0.39 Small bottle of water (0.33 litre)£0.96£0.52 3 course meal for 2£50.00£22.91 1 litre of milk£0.96£0.53 Petrol (1 litre)£1.39£1.07 Last updated on 21/07/2014 source