I did hear of such a plan, but that the UK government rejected it based on the belief it would fuel inflation (getting rid of the 1p & 2p coins).
Australia does not have 1c or 2c coins, but items in supermarkets are still priced to the cent (e.g 99c). Your total bill for all purchased items is rounded (either up or down) to the nearest 5c.
This appears to work quite well in Australia, but I bet some tight-wads insist on paying separately for two items, each costing 42c.