<P> The number of units of measure to which derogations applied was reduced with effect from 1 October 1995 and reduced further with effect from 1 January 2000 . A direct result of the changes that were effective from 1 January 2000 was the requirement that most loose goods sold by weight, volume or length (for example, potatoes or tomatoes that were sold loose, or cheese or meat that was cut or weighed in front of the customer) must be priced and measured using metric units . </P> <P> After 1 January 2000, the remaining non-metric units, allowed by United Kingdom law without supplementary indicators for economic, public health, public safety or administrative use, are limited to: </P> <Ul> <Li> the mile, yard, foot and inch for road traffic signs, distance and speed measurement, </Li> <Li> the imperial pint for the dispensing of draught beer and cider, and for the sale of milk in returnable containers, </Li> <Li> the acre for land registration, </Li> <Li> the troy ounce for transaction in precious metals . </Li> </Ul> <Li> the mile, yard, foot and inch for road traffic signs, distance and speed measurement, </Li>

When did we change from gallons to litres