Foot (unit)
Imperial units

In Imperial units, the foot was defined as 1 / 3 yard, with the yard being realized as a physical standard (separate from the standard meter). The yard standards of the different Commonwealth countries were periodically compared with one another. The value of the United Kingdom primary standard of the yard was determined in terms of the meter by the National Physical Laboratory in 1964 to be 0.914 3969 m, implying a pre-1959 UK foot of 0.304 7990 m.

The UK adopted the international yard for all purposes through the Weights and Measures Act 1963, effective January 1, 1964.
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