Marks & Spencer has trademarked a new eco-label as it tries to ramp up its green credentials.

The 'Thinking Green' label has been trademarked against a huge list of food and non-food. A spokeswoman said registering the label was a "precautionary measure" but refused to comment on any plans.

M&S recently started placing stickers on air-freighted food and plans to introduce a symbol on all packaging telling customers whether they can recycle or compost waste. The moves are part of its Plan A green initiative.