London

The UK uses a mixture of units. Although mostly metric, they are not entirely metric.

Since 1 January 2010, 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:

the mile, yard, foot and inch for road traffic signs, distance and speed measurement,

the imperial pint for the dispensing of draught beer and cider, and for the sale of milk in returnable containers,

the troy ounce for transaction in precious metals.

Wikipedia

Not for road speeds we don't

The UK uses MPH and miles & yards for distance. We also use pints, but UK pints are 568ml so of course we don't want to downgrade to 500ml (although our bottles already have).