I'm afraid you don't have a leg to stand on, as you're trading illegally on a private account. Consumer law states that a buyer can request a full refund from an illegally-trading seller for any reason at all, for up to 1 full year and 30 days, and the trader has to pay their return costs too if they want the item back. And it can be returned in any condition whatosever. In other words, your customers can use you as a free hire shop. The law doesn't reward those who break it.
Anyone who makes, grows, refurbishes, or buys in (new or used) items to sell, is a business and must be registered as such. Not only an Ebay requirement but the law. Note that there is no such thing as a 'hobby seller' in this country, and how much or how little you sell or make is totally irrelevant. Private accounts are ONLY for those selling off their old no-longer-wanted possessions from wardrobe and attic. That clearly isn't you. For confirmation, go to Ebay's Seller Centre (link at foot of any page). For full information, go to the government's website.
I would advise you to upgrade your account from private to business (takes seconds) as a matter of urgency, before you find yourself in big trouble with Ebay (for defrauding them of listing fees) and Trading Standards (for breaching consumer law and denying buyers their legal rights). Most buyers are savvy these days, and your particular buyer may be one of them and may already have reported you.
@weenicnac32
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