Common mistakes include using the wrong visa route, missing documents, giving inconsistent information, overlooking translation or certification requirements, and failing to pay the correct fee or book biometrics on time. Applicants should check the latest requirements on the relevant GOV.UK visa page and keep copies of everything submitted. Do not guess or hide information, as errors or omissions can affect an application and may have serious consequences. If your circumstances are complex, consider advice from an immigration solicitor regulated by the SRA or an adviser regulated by the Immigration Advice Authority.