In summary Ategi brings together people who want or need company in their homes with those who are looking for accommodation and can provide some care and companionship.
The service is not free however, and I think it is quite expensive.
The following links provide information;
http://search3.openobjects.com/kb5/rbwm/directory/site.page?id=lWpEw1CqtJk
and
http://www.ategi.org.uk/
The following button will download an ategi leaflet;