If you wish to return an item you bought through ebay for a money back return you can do so within the first 30 days of purchase by using ebay's own return procedure. They will provide a pre-paid returns shipping label for you to return the item with. Just click on the item in question in 'My ebay' > More options > Return the item.
Only purchases from Cambridge Audio’s official ebay stores are covered by the Cambridge Audio warranty policy:
Products purchased from ebay third-party sellers are ineligible. Please contact the seller to discuss your options.
You must be able to provide your ebay proof of purchase.