The UK Business Visa requires applicants demonstrate adequate financial resources to maintain both themselves and their dependents during their time in Britain. The Innovator Visa mandates potential business founders to possess £50,000 investment capital before starting their enterprise. Start-up Visa candidates must present documentation regarding their financial support although the exact amount varies. The Tier 1 Investor Visa demands applicants to invest at least £2 million into the UK economy. Financial documentation serves as a crucial requirement for obtaining visa approval.