Select the corresponding offer for your voucher and click "Add to Basket". When you're done shopping click "View Basket" found at the top right corner of the Co-op Electrical page.
Just below your order, you will see "Do you have a promotion or gift certificate code?" and a box where you can type in or paste your voucher code. Click "Apply" and your total will then be adjusted accordingly".
Click "Continue to Checkout" to proceed.
Provide your delivery and payment details to finalize your order.