1. Dear *****os, here is a link to the application form for a Permanent Residence Card for youhttps://www.gov.uk/government/publications/apply-for-a-document-certifying-permanent-residence-or-permanent-residence-card-form-eea-pr. You should fill this in and get a Permanent Residence card. Be aware that you must have a Permanent Residence card for a period of one year before you make an application for citizenship. This is because you need to show you were visa free for a one year period before you make an application for citizenship. I would recommend that you get yourself UK citizenship if you wish to continue living in the UK. You are entitled to obtain UK citizenship because you have been living and working continuously for five years in the UK. It is perfectly permissible to hold dual British and Portuguese nationality, so you can retain your Portuguese nationality even if you acquire British nationality and a UK passport.
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