I heard back from Korst Banden yesterday. Seems the Bridgestone tires I ordered are no longer stocked by their supplier, so they've offered me instead a couple of alternatives that they can acquire on short lead time in order to get the wheels fitted next week.
The option was between some different Bridgestones and some Toyo tires. I'd normally have gone for the Bridgestone ones, but they were offering different treads on the front and rear. So instead I went for the Toyo tires. I have Toyo tires fitted on the car at the moment and to be honest I've been pretty happy with them.
So, I now have an appointment booked for Tuesday to get the new wheels fitted, so should have some pictures posted Tuesday night!