Your rights when buying second-hand goods depend on who you bought the item from.
If you bought from a retailer or trader, not a private individual, you’re covered under Consumer Contracts Regulations and the Consumer Rights Act. This means you have the standard right to cancel or to reject under the three criteria.
Buying from a private seller makes things slightly more complicated. As long as the product has been accurately described, you are not entitled to a refund, repair or replacement.