Businesses are allowed to change their address, and there is no requirement that any business should be a Limited Company.
If a business is not a Limited Company it will not be registered at Companies House. That registers Limited Companies, not sole traders or partnerships. Note that "sole trader" and "partnership" are legal terms, and either can have thousands of employees. The title does not imply a single person or just two people.
The current legal status and address of vivaciti in this respect I admit is confusing. However both the domains vivaciti.net and vivaciti.com listed under Contact Us on the website are registered to the 358 address. This however may be an accountant's or similar address, not the address from which the business is run. You would still expect correspondence to there to reach the business owner.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. Sync 59997/15142kbps @ 600m. - BQM
Edited by RobertoS (Thu 21-Jan-16 10:32:56)