Lemaradt egy is szocska, szoval: megis kotelezo az SI hasznalata IS.

"The Units of Measurement Regulations 1995 require that all measuring devices used in trade or retail shall display measurements in metric quantities."

Van amugy egy ket kivetel, de ezt torveny szabalyozza , altalanosan SI van:

With some imperial units still legally mandated for certain applications; draught beer and cider must be sold in pints,[29] road-sign distances must be in yards and miles,[30] length and width (but not weight) restrictions must be in feet and inches on road signs (although an equivalent in metres may be shown as well),[30] and road speed limits must be in miles per hour,[30] therefore instruments in vehicles sold in the UK must be capable of displaying miles per hour.
Azaz a cider es a sort pintben kell megadni, az utakon a tavolsagok yardban es merfoldben merendok, a sebesseglimit merfold per ora, ezert az itt eladott autoknak kotelezo merfold/oraban is mutatni a sebesseget.

"Tartsd magad távol azoktól, akik le akarják törni az ambíciódat! A "kis" emberek mindig ezt teszik, de a nagyok éreztetik veled, hogy te is naggyá válhatsz" - Mark Twain