<P> In the United Kingdom, draught beer and cider are the only goods that may not be sold in metric units; the only legal measures for these are ⁄ pint (190 ml) (rarely encountered), ⁄ pint (283 ml) and multiples of the pint . Other alcoholic drinks for consumption on the premises are sold by metric measure: the ⁄, ⁄ and ⁄ gill measures for spirits (whisky, gin, rum and vodka) were replaced by 25 ml and 35 ml measures on 1 January 1995 and since 1995 wine may only be sold in 125 ml, 175 ml or 250 ml glasses . (Prior to 1995, the size of wine glasses was unregulated .) </P> <P> Before the Hodgson Committee, the metrication process was already in operation . One example was the Ordnance Survey, the national mapping agency for Great Britain, which initiated the Retriangulation of Great Britain in 1936, using metric measures . A metric National Grid was then used as the basis for maps published by the Ordnance Survey from World War II onwards, the War Office maps having had a metric grid since 1920 . The Ordnance Survey decided on full metrication in 1964 . The best - selling 1 inch to the mile range of maps started being replaced with the 1: 50000 range in 1969 . The metrication of Admiralty Charts began in 1967 as part of a modernisation programme . As of 2013, road and street maps with primary scales in inches per mile were still being produced by the company Geographers' A--Z Street Atlas. (1) (2) </P> <P> Another example was the Met Office who, in 1962, started publishing temperatures in both Celsius and Fahrenheit, dropping the use of Fahrenheit from their official reports in 1970 . </P> <P> Many other sectors metricated their operations in the late 1960s or early 1970s, invisibly to the general public, though their use of metric units can be seen in the financial pages of the leading newspapers . Such sectors included the principal London commodity markets (apart from the oil industry) the London Metal Exchange, and the various agricultural markets . </P>

When did the uk change from fahrenheit to celsius