If you live in Uk for 5 or more years you can apply for Permanent Residence in Uk, we don't know the outcome of the Brexit negotiations and if you get the the Permanent Residence in Uk now you will avoid future issues and mainly you will avoid long delays applying for visas if needed , you can download  the application on this link https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/505032/EEA_PR__03-16.pdf