I bought E10 ready-to-go phone credit last week at a petrol station along with a bottle of water, walked to the car, absent-minded, and dropped the 'receipt' for my purchase in the bin as I passed. I'm very tidy. Only after I drove off did I realise it was the phone-credit slip I had just thrown away. I hadn't taken any receipt.

Did I go back? No. A little too embarrassing (and yucky) to go rooting around in the bin looking for it.