I never have a problem using my UK cards to buy petrol on the autoroutes, at the supermarkets with the guy sitting behind the counter is another thing.
At both Leclerc and Auchan I have had my car "impounded" and marched off to the store by security to either take money out of the cash machine or pay at one of the tills instore, why the card won't work on the forecourt but will work in the shop is anyones guess.
What happens quite alot here is if you carry cash and go to a supermarket petrol station when it is closed, it won't be long before one of the natives comes along, lets you use their card and relieves you of your cash. Quite a friendly bunch the french

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On the autoroute on my bike, especially at the unmanned rural peages, the bike has not been heavy enough to trigger the machine, so you can't pay even if you want to, twice I've found a way around the barrier, kept me money and nothing has ever happened, my bikes are on french plates as well.
I tried me hardest to pay, honestly
