A good one is a balance slip from an ATM. It gives time date and location. I blank out the other info with a marker pen. They can (and do) run out of paper from time to time so controls where more than one might be available make sense. Be aware that some chain store outlets e.g. CO-OP and petrol stations sometimes have the head office location on the receipt which could be miles away!.
I recently used Hamstreet (Kent) as a control. The McColls receipt didn't show the location and the ATM said 'The Street, Ashford"! I took a digital photo of the store showing The McColls sign and a post office sign saying Hamstreet. I sent the latter off with a screen capture showing the time and date properties of the photo. One or all of those combined got the result, not sure which! I could have gone to the station and bought a permit to travel of course, as these are also acceptable.
Pubs are generally open later than shopping hours and a swift shandy purchased with a credit/card produces a suitable receipt!
I generally get by with ATM balance slips and garage receipts (depicting Red Bull & Crunchies)
Check with your perm sec as well. They're not monsters, just mad cyclists like the rest of us!
