I've used OCUk a few times in the past but every time I have been allowed to ignore having to fill out this "verified by visa" thing as shown at the last step in the transaction.

I dont know what it is? I dont know why I should fill it out, I dont want to fill it out. It protects my card, how does it protect my card?
I just gave out my card details, why do I need to give them out again?

I dont know what it is? I dont know why I should fill it out, I dont want to fill it out. It protects my card, how does it protect my card?
I just gave out my card details, why do I need to give them out again?