Anything that counts in the UK is metric. You purchase petrol in litres, when you put paper in you printer it is A4 (a metric size), threads on screws are metric (like GL14), when you go to Tesco's you will purchase in kilograms and liters. The metric system is complete where ever money changes hands. People still measure their weight in stones because at 14 pounds to a stone, it sounds like you weigh a lot less!