Hi again
Creditexpert is the consumer facing name and website of Experian.
http://www.creditexpert.co.uk/I've been with these guys for anything credit rating related for the last 4 years or so.
It's 'free' to check I think for your first one, then it'll cost each time you check - unless of course you can blag some vouchers or promo codes etc.
Remember, you should check your credit report fairly frequently to ensure all is well, and that any errors haven't occured and of course for security purposes.
I think for their main demographic, providing passport details and sending bank statements isn't really needed. However as this site is geared towards recent and perhaps ILR immigrants, things are different. It's well known that being on the UK electoral roll register increases your credit score, yet many immigrants aren't able to do that becuase of their visa status. By talking to these companies, I think they are being a little more lenient in increasing scores when that happens by being in touch with them and providing anything which helps prove your credit worthiness. A Passport is essential for any new immigrants. There's alot of immigrants who have fake passports etc and if you can prove that your all totally 100% legit, then providing ID like this shouldn't really have to worry you.
Remember, credit ratings and the general availability of credit in the UK is going to be very tough the next few years, so boosting your rating has got to be significantly mre important than compared to recent years where money was thrown around like water. The quicker you can increase your score as a recently arrived American the better!
Cheers, DtM! West London & Slough UK!