Hello,
First of all, thank you all, for your replies and your effort.
Probably, as Peter said, it is too late to cancel the autorenewal.
Hugh, I am not in the UK, I am Greek. I just thought that the deduction of £10 (if this would take place) would be the euro equivalent (around 12 euros).
By the way, just for your info, the email address from which I received the email is: norton@nortonfromsymantec.com
Once again, thank you all, for your replies and your effort.
Jimmy_S