It was a thruppenny bit per bottle when you staggered to the lorry with your arms full of other people's bottles. Not to be sneezed at and when you took the money back to the owners they gave you half.
I don't think it's been thought through either. All supermarkets are designed to push stuff out, not collect it in. I am highly keen on recycling and not polluting and I regularly pick up litter on our village green, by the way. It would affect the recycling bins for the council. The problem seems to be that there is no one authority in charge throughout an area to pull it all together.
I'll happily pay a deposit if L.A.s are spared the expense of dealing with plastic bottles - but they have invested so much in recycling (our area came top in the country, I think) that it would be a waste to duplicate it. A tough one.