I think that was actually done during the French revolution and there are still some decimal clocks about.
We're completely inconsistent. While all food is now in metric, it's often in imperial equivalents. E.g. a standard packet of sausages is 454g equivalent to 1lb. While we (decreasingly) weigh ourselves in stone, drink pints and have miles on our road signs, we have no education in the imperial system at all so I was never taught how many feet to a mile.
We measure our spirits in gills. A pub measure is a 1/4 gill