Alexandra,
Посмотрите ссылку:
***********.ukba.homeoffice.gov.uk/workingintheuk/eea/wrs/
Once you have been working in the United Kingdom legally for 12 months without a break in employment, you will no longer have to register on the Worker Registration Scheme. You can then obtain a residence permit confirming your right to live and work in the United Kingdom. See For European citizens for information on obtaining a residence permit.

__________________
Hess Is More - Yes Boss