The metrication of Admiralty Charts began in 1967 as part of a modernisation programme. The Metric System was adopted under the 1976 Metrication Ordinance. The Australian experience of metric conversion showed no evidence of price inflation caused by metrication. After metrication in the mid-20th century by both countries, the unit became officially obsolete. Metrication in the United Kingdom began in the mid-1960s. Confusion over units during the process of metrication can sometimes lead to accidents. These sentiments were echoed in the final report of the Metrication Board. The opinions of the trade organisations with which the Metrication Board could negotiate were fragmented. Before the Hodgson Committee, the metrication process was already in operation. The retail industry proved difficult for the Metrication Board. The Ordnance Survey decided on full metrication in 1964. An early change was the metrication of horse racing. A formal government policy to support metrication was agreed by 1965. During the 1970s, there was a push for metrication of U.S. government standards. The metrication of France took until about 1858 to be completed.