Oliver - You are from London. One would expect a reasonable level of English language from you. This site is international and has many members whose first language is not English. Please try to type so that everyone can understand.
I THINK you were trying to say that you don't know how to use km/h (which, I'll add, is the actual unit of speed in the metric system. "KPH" doesn't exist) and prefer mph. In that case, GT4 should be good for you, since it is switchable between metric and Imperial units.