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You can make a ‘subject access request’ to obtain personal information about you that is held on the Home Office’s immigration records. You will receive a response within 30 days of your identity being verified by the Home Office. https://www.gov.uk/government/publications/requests-for-personal-data-uk-visas-and-immigration/request-personal-information-held-by-uk-visas-and-immigration
AFAIK, if you’ve already attended your biometric appointment and submitted your supporting papers, the only way you can try to correct your error is to withdraw the application and re-submit.