Cadbury has lost more ground in its long-running battle to protect the particular purple it uses to wrap its chocolate.

After losing an appeal last month, Cadbury has given up a trade mark.

Lawyers said the company may have decided the trade mark application is unenforceable after a court ruled it was too wide-ranging.

The move makes it harder for Cadbury to stop a rival from using a similar colour for its products, a lawyer said.

In 2012 Cadbury

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