telling you that you ordered an iPod for £399 please DO NOT phone the customer service number on the email.
The mail is a hoax, and the number given is that of the Cambridgeshire Police headquarters. So far today the police have received over 14,000 calls from people concerned that their cards have been charged - which is exactly the result that the sad person who perpetrated the hoax wanted. The individual concerned has a grudge against Cambridgeshire Police (obviously), and innocent people by the thousand have been drawn into the hoax.
Please just delete the mail - the Police would be grateful if you didn't phone the number, you'll just tie up their phone lines.