Customers who use PayPal for their purchase will automatically be part of the "Buyer Protection" programme.  

"PayPal’s Buyer Protection programme entitles you to reimbursement for the full purchase price of the item plus the original shipping costs you paid, if any, when you don’t receive your item from a seller, or when you receive an item, but the item isn’t what you ordered."

Click on the following link for Paypal's terms and conditions: PayPal Buyer and Seller Protection | PayPal UK