...building sites and returning them to local shops for the refund. We even had a file of which shops took which bottle and which ones had had enough of scruffy little oiks bringing in cement-encrusted Tizer bottles.
Occasionally, after payday, we'd find an empty soda siphon, usually next to an empty whisky bottle. It was like Christmas had come. 3d for a pop bottle - 7 shillings and sixpence for a siphon!