Thank you Lucapooka. I checked this guidance about dozen times already. Well, their description of the "letter" fits to what you can see on the "statement", Natwest bank statement has all this information.
I also called Border Agency today. It took me only 5 mins! The line was free! And the person there told me that yea, bank statement from Natwest should be enough. But, he added, it must be notarized or have an official bank stamp on it. I told him that Natwest does not do stamps, they say they send only postal statements and all of them are without stamps. He said - Ok, if the bank does not offer it, then it's Ok to send their standard statement because it is Natwest anyway, well known British bank.
So, I guess it answers it. I still does not feel 100% satisfied but maybe it's because I sent application by special delivery 2 weeks ago and still did not receive biometrics letter... I hope my bank statement should be enough. Anyway, I did not have much choice. I think they should write more details in their guidance because British banks are very strict and lazy. So they provide lots of info in the guidance about complicated cases but nothing about simple case when you have all money on one account at Natwest. Anyway, in the application form they ask me to sign that I allow them to do checks with the bank. So I think it should not be too hard to check it with Natwest that I have money there. I hope Border Agency would not make my life difficult with this application. They call me high-value migrant, so I hope I will be treated as such at least in the application process. Anyway, I don't see what else I could send them and person on the phone agreed with me, so I guess it should be enough.
I will update this forum when I get visa.
If anyone had any similar question, please write here and put my mind to rest... This is frustrating... I had administrative review once because I forgot to put some stupid certificate with the application and it took 7 months(!), I hope it would not happen again.
