I noticed the elongated holes too. The Continental pins are spaced slightly farther apart but are also slightly smaller in diameter than the British ones. In fact the Euro-type plug will slip nicely into the holes intended for the live & neutral of a 3-pin 5A plug, except they don't make very good contact.
I've seen some people jam two-pin Euro-plugs into 2-pin 5A adapter outlets here -- Some makes use a fairly flexible rubbery plastic which allows the pins to bend just enough to fit, but again, contact is not always good and I hate to think how much arcing and burning is caused by this.
If it was bought for French-Africa, is that "Schuko" plug of yours the type which also has the hole in the front to accept the ground pin on a French outlet?
