As a company gains the benefit of limited liability and is treated as a separate legal entity, it must have its own Bank Account and monies must be kept separate to any individuals' money.
In opening a company Bank Account, searches will be made against the company at Companies House, and against individuals involved with the company.
To open a Bank Account, it is a usual request to see hard copies of company documentation, in a similar way that an individual is asked to produce documentation to open a personal Bank Account.