Your high street rights apply equally when buying over the internet as when shopping on the high street. So remember, goods must be of satisfactory quality and adverts and descriptions must not be misleading. BUT with auctions and private sales the general rule is "buyer beware". The Advertising Standards Authority and the Office of Fair Trading websites have further information.
Don't forget that you must be given key details before you buy such as the supplier's postal address. Also, items must be delivered within 30 days unless otherwise agreed. The DTI website contains more details.
Look for a closed padlock sign
at the bottom of the screen. It shows that your details are protected when being sent.
Other Shopping Tips Websites
Consumer Government Website