@Schroedinger99 sorry Mike but that's evidence free hyperventilation.— Rob Ford (@robfordmancs) March 6, 2017
The UK grants permanent residency to [employed and the self-employed] who [have] been resident for five years or more. They have the right to apply for formal permanent residency status, for which they need to fill out that 85-page form. They do not have to do this and are still deemed to be permanently resident if they do not fill in the form. There are, however, two reasons why they might choose to do so. The first is insurance against a retroactive change in rules. It has happened before. The second would be to become a UK citizen, for which formal permanent residency is a prerequisite.
“Scenario 3: Colette, a Belgian citizen, came to the UK for a holiday in August 2003 but then remained without permission or entitlement under community law. Any residence in the UK after her entitlement under community law came to an end was residence in breach of the immigration laws.”