1. Dear *****a, you first need to obtain a Permanent Residence card and hold it for one year, before you can obtain British citizenship. This is because it is a requirement that you be visa free in the UK for one year before you apply for citizenship of the UK. The only way you can prove this fact is if you hold a Permanent Residence card for the necessary one year period.
2. Here is a link to the necessary forms for the application for a Permanent residence card together with guidelines https://www.gov.uk/government/publications/apply-for-a-document-certifying-permanent-residence-or-permanent-residence-card-form-eea-pr
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