Absolutely. We have tried existing off the "express" store 5 mins from us but the prices are killer. We have had to switch almost solely to the discount markets because of the cost of living.

I barely use my car so I have thought about selling it, but we don't have a reliable car hire scheme in my town so if I needed one for work I would be screwed. I think though that the savings from being car-free would in no way balance out the costs from the expensive supermarket. Difference of a weekly shop is like £50!