If you are a British citizen, a Swiss national or a national of a country in the European Economic Area (EEA) you do not need Home Office permission to work in the United Kingdom.
The EEA includes these countries:
Austria
Belgium
*Cyprus
*Czech Republic
Denmark
*Estonia
Finland
France
Germany
Greece
*Hungary
Iceland
Ireland
Italy
*Latvia
Liechtenstein
*Lithuania
Luxembourg
*Malta
Netherlands
Norway
*Poland
Portugal
*Slovakia
*Slovenia
Spain
Sweden
United Kingdom
* 10 Most recently admitted states.