You can do either, Jon. Hire the R6 or get some 208RRs fitted to your bike on the morning of the day. Just give the school a ring to reserve a pair for you- they usually have several with them, and the mechanic will put them on when you arrive. IMHO they are a really good tyre and work well in the wet.
I agree with Jools about riding in the rain.
Be careful with hiring the R6 though! You may become a convert
Regards,
Gary.