There are however notable exceptions.
The UK is metric with the exception of speeds that are still marked and posted in miles / miles per hour.
I think the UK is a whole load more muddled up than that. I know my car does 50mpg, but I buy diesel in litres. I'll order a pint of beer, and what I buy in the supermarket is a two pint bottle of milk (but it's labelled as 1136ml) and a one litre carton of juice. I'll buy 6x2 (inch) timber and then chop in up into lengths measured in mm. I weigh 11 stone, but I eat margarine from a 1kg tub. I took window measurements in mm and was sold fabric in yards. Land area seems to be measured in acres or hectares variously. The only thing I think we've sorted is never to mention Fahrenheit, but then we haven't got as far as Kelvin on the whether forecast (but neither have the French).
The only thing that doesn't support ARM is "big" Windows 7, and this is changing:
http://www.microsoft.com/presspass/press/2011/jan11/01-05socsupport.mspx
Their Secure1000 system claims to be active (from here): "The Rapiscan Secure 1000’s patented technology is composed of an ultra low-dose X-ray source that images backscattered X-rays through to a remote operator’s workstation."
"Conversion, fastidious Goddess, loves blood better than brick, and feasts most subtly on the human will." -- Virginia Woolf, "Mrs. Dalloway"