We e-mail you a week before your order is due to be processed, allowing plenty of time for you to make any changes via your customer account.
If you miss this e-mail and didn't want the colour, we'd ask you first to let us delay your next delivery by a suitable period. Though you are always welcome to return the product for a refund, delaying the next delivery instead will help us all to reduce waste.
Our friendly support team are here to help, so please do contact us.