It does indeed look as though I have the Sport, rather than the SuperSport, and I felt the price I paid was reasonable either way.
The main reason I've questioned it is after hunting for insurance on Saturday (I took delivery of the bike then) I ended up stating what was on the V5, which is 750SS. I now don't think that it would have made a difference to the the final premium, especially if there's not much difference between the price of the two models.