There was an agreement that we should look to change our road signs to metric starting in 1971. We just haven't got round to it yet
There are numerous areas where we aren't metric
Distance - miles
fluid - pints(well, the only fluid that counts!)
area - acres
height-ft and inches
food - ounces, lbs etc(yes I know about the metric matrys etc but you just listen to people ordering fruit and veg everyday, its a quarter of this, 2 lbs of that etc)
Petrol- gallons
As for driving on the left, we do it, so do Japan, Malta tag along as well. why do others do differently? perhaps this explains
http://users.pandora.be/worldstandar...ft.htm#history