Costcutter-affiliated Sunstar Group is the latest store chain to commit to a 'Challenge 25' policy for sales of alcohol.

The policy, which involves asking all alcohol shoppers who appear to be under 25 for ID, has been adopted in all 20 stores in the South London group.

Operations manager Syed Husain told C-Store: "It's important to do as much as you can to prevent underage sales and you can't risk losing your licence. We believe the new policy will really help staff to do the right thing."