Dangerous
Do not give your details!

This site claims it can guarantee succesful application for three great products with one application (First Milllenium platinum £5,000; First premier mastercard and Unsecured Loan up to £20,000.

Sounds good, but look step 1! the application form;
It asks for your Card Details, Expiry date and CV2 Code (I assume that's the card verification or security code on the back of your card).

You have got to be mad to give these details as you will probably find your account cleared out, they might well be legit but heed the warning signs as no business would ask for these details unless they intend to take a payment from your account. I think its a trap and you will only find out how much you have paid for their services after you have given them your details.

Be safe, It's too good to be true don't go there.