Whether you are a Hungarian accountant, a Polish farm worker, or a Latvian bartender wanting to work in the UK, you would need to apply for a registration card and certificate under the Worker Registration Scheme once you find an employer in the UK. Whether on a short-term or long-term contract or assignment, if you start a new job in the UK after 1 May you would need to apply for this registration card and certificate.
You would also need to apply for a registration card and certificate under the Worker Registration Scheme. Your status will then be considered legal in the UK and your employer will no longer be at risk of getting into trouble.
You would not need to apply for a registration card and certificate in this case. On arrival in the UK, however, you would need to register Inland Revenue immediately. There is a penalty of £100 for late registration.
You should register as soon as you start a job, which will allow you to begin working towards 12 months' of uninterrupted employment. At the end of the 12 months you will get full rights of free movement throughout the EU. If you have not registered within one month of beginning work, your employer will not be authorised to employ you any longer.
Yes, but you must apply for a separate registration certificate for each employer you are working for.