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The options for cancellation are explained here https://www.gov.uk/cancel-visa
If you have not yet given your fingerprints and photo, you can cancel your application online and your fee will be refunded.
If you have already given your fingerprints and photo, contact UKVI to cancel your application. Your fee will not be refunded.
If you have already given your biometric information but are unable to travel to the UK because of coronavirus, send an email to the coronavirus immigration help centre [email protected] They will let you know if your fee will be refunded or not.
Your email must be in English and include:
your full name
your nationality
your date of birth
any UKVI reference numbers you have been given
Use βPOST BIOMETRIC REFUND REQUESTβ as the subject line.