right of withdrawal
The right to change your mind and cancel a purchase made at a distance, such as online, by phone or at your door, without giving a reason. The period is normally 14 days, counted from the day you receive the goods or, for services, the day the contract was made.
You must tell the seller clearly that you are withdrawing within that time; just sending the goods back may not be enough. The seller must refund what you paid, but you may have to pay the return postage.
The right does not apply to everything, for example to some tailor-made goods or perishable food, and it does not apply in an ordinary shop unless the shop offers it.