No, unfortunately once a Gift Card is purchased, you are unable to exchange, return or refund Gift Cards as they are treated like cash.
Gift Card terms & conditions of use
The Gift Card issuer is Smiggle UK Ltd ("Smiggle") Company No. 06720710. A lost, stolen or altered Gift Card will not be replaced, refunded or redeemed. Once activated the Gift Card is: redeemable for merchandise at Smiggle UK stores and online in the country of issue; not redeemable for cash and is not a negotiable instrument; not able to be reloaded; partially redeemable. Gift Cards expire three years after the issue date or until no amount remains on the Gift Card. Cash, refunds or credits will not be given for any unused amount after the Gift Card expires.