On the 1881 census, Thomas' wife is Mary Elizabeth.
So this must be their marriage?
September qtr 1879
Eastbourne district vol 2b, page 94
Swadling, Thomas Samuel
+ and on the same page +
Pearson, Mary Elizabeth
And the 1881 census:
Reference RG11, Piece 1039, Folio 128, Page 1
4 Dennis Cottages, Eastbourne
Swadling, Thomas Head M 21 Carpenter b East Hoatley, Sussex
Swadling, Mary Elizabeth Wife F 18 b Eastbourne
Swadling, Elizabeth Daughter F 1 b Eastbourne