When a private company is formed, every director of that limited company has to have what is known as a service address. This is a location where they can be contacted by Companies House with important legal notifications.
The service address need not be at the director's place of business or home. It can be any address, even a foreign address, but it is important to remember that Companies House need to be kept informed of any changes to directors' service addresses, as well as contact details for all the company's shareholders. Failure to do so can lead to unwanted legal complications and penalties.