Have you noticed how you now see people walking around juggling and dropping groceries as they try and get the shopping home without spending 5p on a carrier bag? It's amazing how you can promote recycling and the environment for years with little effect on plastic bag use and then as soon as you start charging money people respond overnight. Money talks. What a surprise?
So how about we go a step further and offer a discount for not taking the packaging.
We're all used to the checkout asking if we'd like a bag. How about they also ask if we'd like to leave the packaging behind? If you say yes then the apples come out of the pack and go loose in your bag and you get a discount. The shop then returns the packaging to the manufacturer when it can be recycled or even reused.
This would work great for fruit and veg and take us back to the good old days of the green grocer tipping the loose tatties into your shopping bag.