Dick,
The other big difference in the USA is that a vfr flight doesn't require a clearance to enter class c it just needs to be in radio contact with ATC and have a transponder(or an exemption). You can't disobey an ATC instruction but you don't need their permission either. The best way to think of the US Clsss c is as Class d with radar.
Sometimes transiting some of the smaller Class C airports in the USA you call up approach and state you type, callsign location and destination and the response you get back is just an acknowledgement, perhaps a transponder code perhaps not but basically their controlled airspace is very permeable to small aircraft.
When they do put a plan in the system over there they really only put in the minimum information and so it is quick over the radio.
No_one