Is the start date on the day you make an appointment to VFS or will it start on the following day after you submitted the application?
put on hold as unclear what you're asking by Dirty-flow, Musonius Rufus, Giorgio, David Richerby, gmauch Oct 13 at 20:35
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The application process starts when you pay the fee. The visa processing period itself starts when you’ve attended your appointment and enrolled your biometric data. Processing timescales exclude weekends, local holidays etc You can check likely decision timescales at https://www.gov.uk/visa-processing-times