Hi Pat,
I have found this family on the 1891 census and had a thought. This Samuel was only 25 on this census but he would have been 35 if he was born in 1856? Are you sure you have the correct dates? I have a lot of Gardiners on my tree including a Samuel from 1856 but I have a feeling he went to Australia as I can't trace the family from 1856 up at the moment.
I will try my best to help sort this for you and get back to you as soon as I can
kind regards
Karianne