If you are an EEA National, then it is not compulsory for you to get an EEA Resident Permit as it only confirms your existing rights to stay and work. This is simple enough but you also need to understand the residency rules and how they apply to you. For instance, if you have a non-EEA national family member deriving his / her rights from you, then the situation is different and you should look at applying for an EEA Residence Permit.
An EEA residence permit visa for the UK entitles you as an EEA national and your dependants to the right of residence. Right of residence under European Community law gives you as an EEA national and your dependants the right to live and work in Britain under UK immigration laws. If your family members are not from an EEA member country or Swiss nationals, they may need to apply for an EEA family permit before they can come to the UK. This permit is similar to a visa.
If you have found employment in the UK then you automatically have the right to work here and live here. If you comply with these restrictions, then your family may join you here also. You do not have to work while you are living in the UK but if you do not work, you have to be able to support yourself and your family in the UK without the use of public funds (benefits etc).
If you and your partner are not married or in a civil partnership, you must be able to show that you are in a durable relationship with each other. You and your family members are allowed to accept offers of work; work as an employee and/or in self-employment; set up a business; manage a company; set up a local branch of a company. You can also do all these types of work if you are studying in the UK.
You may also apply for an EEA Registration Certificate. This is a document, issued to an EEA national that confirms the holder’s right of residence under European law. You do not need a registration certificate to be able to enter, live in or work in the UK.
A person who has a right of admission by virtue of regulation 11(5) can apply for a family permit to facilitate their admission to the UK. A person will qualify for an EEA family permit where they can demonstrate that they meet the conditions in regulation 15A and regulation 11(5).
Further information on all of these points can be found at http://www.ukba.homeoffice.gov.uk/eucitizens/rightsandresponsibilites/#header1
When you have lived in the UK for a continuous period of 5 years, you can apply for confirmation of permanent residence. Your family may also need to apply for UK Residence Cards. These are issued to EEA nationals’ family members who are not EEA nationals themselves
If you are a Swiss national or Swiss company that conducts business in the UK, you may send non-EEA or non-Swiss national employees to work for you in the UK for up to 90 days without needing to apply for a work permit.
If you are an EEA national in the UK as a student or as a self-sufficient person you must have comprehensive sickness insurance for the duration of your stay in the UK.
Members of the European Economic Area (EEA) include nationals from the following: