I guess the Sales of Goods Act would apply in the UK and you could take it back to the store for a full refund or replacement.
The mini would not of satisfactory quality if it had unacceptable defect. I can't imagine staff arguing the point if a fuss was made in-store.
Satisfactory quality is defined as what a ‘reasonable person’ would regard as acceptable, and takes into account factors such as price paid, fitness for purpose specified, appearance and finish, freedom from minor blemishes, safety and durability. If it becomes apparent that an item is not of the quality you were led to expect, you were not aware of any such defect when you bought it, and you bought from a seller acting ‘in the course of a business’ (i.e. not an informal sale), you are quite within your rights to go back to the retailer, even after some months of use. If a product develops a fault within the first 6 months, the assumption will be that this defect was present at the time of purchase and you will not have to prove anything. If you are returning an item after this 6 month time period, this automatic assumption does not apply, and it may be up to you to prove the fault did not occur through misuse. You should also consider aspect of durability and acceptance.
The same applies to stuff bought over the Internet in the UK too with the Distance Selling Regulations adding additional rights for UK buyers.
One of the most important implications of the distance selling regulations is a cooling off period of 7 working days during which you have the right to cancel and get a full refund. The supplier must provide you with details of your cancellation rights, any duty to return the goods should you cancel, and whether you will have to pay for this. In return, you must provide notice of cancellation in writing, which this must be posted, left at, faxed or emailed to the business address of the supplier no later than 7 working days after receipt of goods.
However, if you have bought an item as the result of a successful bid on e-bay, the distance selling regulations (and hence your cooling off rights) do not apply. Neither will the regulations apply if you have bought the item through a private sale with an individual who is not acting as a commercial entity.
If however you have bought the goods as a result of a ‘buy it now’ transaction, or from a commercial trader acting in the course of business, you will be covered, and can take full advantage of your cooling off period.
Under the distance selling regulations, you are quite within your rights to change your mind at any time, return the goods and get a full refund. This means without financial penalty of any kind – such as a cancellation charge or a ‘restocking’ fee. The supplier must also refund any delivery charges paid by you, and any other costs related to the contract. Refunds must be made within 30 days from cancellation, whether or not the goods have been sent back. Any related credit agreements will also cease to exist.
You may be required to pay to return the goods, but you must have been informed of this as part of the pre-contractual information. if the goods are faulty, then under Sale of Goods, the supplier will always bear the cost of returning them.
Under a distance selling contract, a supplier cannot make refunds subject to the goods being returned unopened in their original packaging. One of the principles of the distance selling regulations is to give you a chance to examine the goods at home, not having had a chance to do so in the shop. It would be impossible for you to do this without opening the packaging and trying the product out. Having said this, you will still be under a duty to take reasonable care of the goods while in your possession, and may be subject to certain instructions such as not to wear shoes outdoors, or remove hygiene seals. But you can never be penalised simply because you did not return the goods in their original packaging.
Careful with that axe of yours... Dain!