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For applying for naturalization, you will need to fill in the application below:

https://www.gov.uk/government/publications/become-a-british-citizen-by-naturalisation-form-an

Steps you need to take:

1. Check your eligibility
2. Prepare your documents
3. Fill out the online application form
4. Book your appointment to submit copies and your original documents
5. Attend the appointment to submit your documentation
6. Wait for a decision and if accepted, attend the ceremony

Source: https://onlineimmigrant.com/british-citizenship/