[Razer896]

I SE'd for the first time last week on a 55 pound keyboard. however, I have had to sign an affidavit legal form but got the refund (I used the box came empty method). I have made a new account and I want to SE an pc case and get something legit alongside it for about 70 pounds , I am also shipping to an different address this time:  

What method should I use?
will I be able to use the same C.ARD even though I've had to sign an affidavit?              (kind of have to and its a UK under 19's C.ARD)

Would appreciate any help

Wouldn't recommend to sign any legal document. They can use it against you in court and so on.