From my resource
EGGE John 26 years Status not recorded Father unrecorded
PERRING Mary 18 years Status not recorded Father Peter PERRING
8 Apr 1857
At St Jude Church Port Elliot EnB 308461
Not to do with your search but I thought you may like to see this church today...was built c1853. There are many photos on the web but some appear distorted. I think it is a delightful church....have walked past it many times
http://www.flickr.com/photos/a777thunder1/5844084368/I've found out since last night that the other children were born in SA so it's all falling into place.
Only one birth registered to this couple in SA
EGGE Richard John
15 Jul 1860
Father John EGGE Mother Mary PERRING
At Goolwa EnB 21/69
I think Mary Perring had a sister called Adelaide (internet surfing) but her married name was not Lenord so the witness on the marriage cert is still a mystery!
If you have a copy of your gggrandmother's marriage cert could you snip the signature and post here.
It is possible you have misread the name of the witness...could it be SEWARD as....
Birth
HILLIER Mary Jane
4 Aug 1851
Father Amos HILLIER Mother Adelaide PERRING
At Adelaide Ade 3/249
Marriage
SEWARD William 25 years Status Single Father unrecorded
HILLIER Adelaide 26 years Status single?? Father unrecorded
11 Feb 1856
At St Jude Church Port Elliot EnB 26/137
Birth with another variation on the surname
SEUARD John Henery
28 Sep 1858
Father William SEUARD Mother Adelaide PERRING
At Hindmarsh Island EnB 16/380
Another variation of the surname -
SEAWARD.
When and where did you gggrandmother's marriage take place?
Cando