Supermarket shoppers are spending £470 a year - a sixth of their food budget - on packaging adding up to a total of £15bn.

This is the key finding of the Liberal Democrats report - How Green Is Your Supermarket?

For the purposes of the report the Lib Dems spoke to the UK’s nine biggest supermarket chains about packaging, waste and energy use.

The 26 recommendations made in the report included plastic bag recycling points at all supermarkets, Bags for Life on display at checkouts, targets for increasing the percentage of packaging made from recycled material and supermarkets to set targets for lorry mileage.

Lib Dem environment spokesman Norman Baker said: “With one supermarket for every 10,000 people, the big chains have a duty to provide environmentally friendly alternatives, support local producers and the British organic industry and commit to saving energy.

“On sourcing, energy use and packaging, some supermarket chains are taking the lead, but that best practice needs to be shared.”