My sincere apologies for not replying to your message before now - I have had a mental block so took a break from the whole subject for a while - if you still want 1881 census for Cunningham, it is as follows
Rotherfield RB11 1050 ff78 p.23
James Syvers Turk head m41 sweep and army pensionerborn Rotherfield Maria Turkwife30 born Londonderry Cunningham T Turk son11 born Londonderry Michael Turkson9 born Dover Thomas G Turkson8 born Dover Samuel Turkson8 born Clare Easel, Ireland John H Turkson4 born Canterbury
In the 1891 census this family surname is spelt Severs.
Hope this helps, and sorry again for the lengthy delay!