It seemed a good idea to order them before I, and everyone else, needed them. I read some reviews and the Schwalbe Studded tyres seemed to be well recommended.
There don't really seem to be many choices in the 700x35 that my bike came with. Of course it will be a few months before I get around to adding any sort of a review. I am little concerned that they will clear the fenders; but there seems to be plenty of clearance. Here's to hoping for a slip free winter.