Can I change the expiry of a voucher or batch of vouchers I have created?

Yes you can - providing that the vouchers have not yet been redeemed
Please go to the order history page of your account, identify the batch that contains the voucher/s then click on the red & white arrow at the end of the row.

You will then find options to edit individual vouchers or the entire batch at the right hand side of the page as below:

Screenshot 2021-02-24 at 11.52.54

 

Please note: Recipients will not receive any notification that the expiry date has changed.