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I would say that simply changing the tyres for a better performing tyre unlocks a lot of traction and handling from the chassis.

Toyota eventually collected the GT from home and fixed a leaking hose which apparently was a known fix on the Toyota faults forum. The car has now been returned at no extra charge and all is now well, fingers crossed!

I think 7.5 will be fine with a 225 tyre. Would maybe sit slighter squarer and give better feel on an 8. Although if there is a wheel you like in 7.5 it will be fine also I think 225 wide tyres on an 8 inch wheel is the sweet spot for the NA car. I agree with @martinT that a bit of extra grip does unlock more of the cars chassis potential.

I must be in the minority in thinking that the stock car is under-tyred. Never mind 'playful', with Primacies it's just damned dangerous in the wet. With the chance to buy new wheels, I would go again for 8" wheels with 225 tyres for an NA car. With my supercharged car, my 8.75" wheels with 235 tyres are just perfect. Still pretty playful if I want it to be.

Thanks for the replies everyone, I'm sold! Plus I see V105s are available in 215/40-18, so that's a nice plus for a bit more movement under the car

Another happy V105 user here.... Went from stock primacy tyres on the OEM wheels to some Yokohama V105 in 225/40-18 on my new wheels and haven't looked back and I am on my 3rd set of V105 now Can still swing the back out if you provoke it, takes a little more effort but the way the tyres behave is so much better. The breakaway is very progressive and gives you a lot more trust in what the car will do. The primacy was more grip followed by VERY sideways all or nothing. These are much more predictable and therefore fun Was tempted to jump on the Michelin PS4 bandwagon last time I needed new rubber but decided "if it aint broke don't fix it" and just got another set.