This page explains what proof of you must send from an authorised financial institution in the United Kingdom to support your initial application to the investor category (Tier 1 Investor) under the points-based system to come to the United Kingdom.
Full details of all requirements are in the immigration rules at paragraphs 245 O-U of part 6a and Appendix A, which you can find on the right of this page. You must read the policy guidance before you apply under this category. You can download the guidance and application form from the Applying section.
This must be an original letter, on the official letter-headed paper of the institution. It must have been issued by an authorised official of that institution and must confirm all of the following:
A body that provides financial services to clients, for example a bank, building society, credit union, stock brokerage or asset management firm.