As an EU or EEA citizen you do not require a visa for entry into the UK. Useful information about living in the UK can be acquired from the following websites:
You are a European Economic Area (EEA) national if you are a citizen or national of one of the following countries. If you have permanent residence in, but not citizenship of, any of these countries, you are not an EEA national.
Austria, Belgium, Bulgaria, Republic of Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom.
Iceland, Liechtenstein and Norway are EEA member states, but they are not members of the European Union (EU).
Switzerland is not a member of the EU or the EEA. However since 1 June 2002, Swiss nationals have had rights which are similar to those of nationals of EEA countries.