"Dave Plowman (News)" wrote in message
...
In article ,
tim..... wrote:
In the case of Lidl, charge everyone on entry to the carpark, provide
a full refund of that charge when they leave the carpark and can wave
the till slip at the exit boom gate. And have the barcode on the till
slip that ensures that a particular till slip can only be used once
at the exit boom gate.

I see a black market in used till slips from people who haven't parked,
forming very very quickly

No need - many just leave them in the trolley.

they wont if they have a resale value