Hi Mike,
I hope I'm not mistaken, but I can't find either Charles or Mary Ann after 1881 .. although I'm assuming this is the death for Mary Ann .. ?
Death, Dec. qtr 1886
Mary Ann Small, age 66
Tunbridge, Vol 2a, page 360
Added .. Having said that, I've just looked at the death for Charles Small, aged 90 .. and I can't find two people of this name living in Kent, on any other census year, other than yours ??
Kind regards,
Pels.