Groundbound:
I'm no expert, but I think the difference between special VFR in the Class A control areas and VFR in the class D control zones is important. In the first case, ATC is responsible for providing separation, in the second case you (the VFR pilot) are and you'll only get traffic information from ATC.
That said, the few times I've been to the Channel Islands, I've found ATC to be very helpful.
Do read the AIC about Cap de la Hague, though.
Regards