My experience is the opposite. I find a narrow selection of mediocre goods in the UK, and a much wider variety of high quality products in the continent. I can't get decent charcuterie without going to a deli, and half the French products I want to buy I have to go to Waitrose to get. Everything from beverages to cheese is really limited, typically only two brands in any given category, one of them usually the store brand.

I feel like the UK supermarket industry took The Paradox of Choice too seriously.