I would not use http://www.officialiphoneunlock.co.uk if I were you.
Their site is not secure. You are daft if you give them your bank details over a site that is unsecured.
They are a 2 bit company. If they were in any way official they would use official payment methods.
Avoid them like the plague.
I'm going abroad soon and need to get my iPhone 5 unlocked, and i came across this website. Has anyone had any experience with them? Good or bad?