How do I locate vouchers I’ve bought?

On the platform, from the Home page click on ‘Voucher History’ in the ‘My Account’ box.  You will see all the vouchers you’ve previously ordered, each with a button to ‘pop out’ the voucher :

Because Kew Rewards is not informed when you have spent a voucher, ‘used’ vouchers will remain in your Voucher History, however the most recent will always appear at the top of the list.