Wow! Thanks everyone for all the helpful hints and information, there's a lot of stuff in there. I really appreciate it. In answer to the questions posed.
1. Anne Evans is shown living with Father Ebenezer aged 6, Birth year 1875, Address Berllan, Penboyr in 1881 Census. Also shown, 1891 Census, Anne Evans, aged 16, Perthiteg, Penboyr.
2. Ebenezer Evans - profession Wool Weaver on census, Weaver on certificate.
3. Henry Jones profession - Labourer on marriage certificate, Ag Labourer on census.
4. No actual birth date for Anne evans as yet, but think I may have got it down to March Quarter with a GRO Volume and Page no ref, just by using age on wedding date (assuming its 17yrs, and date of 1901 census, then by elimination going by age it must be between Jan and Mar 1875. Just have to chance it and buy certificate and see if its right.
5. Osprey, thats correct its my family with the 1901 census, also confirmed in 1911 census living in Margam, but still showing employment as Manager of Welsh woollen mill, with his brother in law (Anne Evans brother) lodging there, and showing employment at same factory as him. Odd, as I don't think there were any woollen mills in that area. Unless they commuted - unlikely I would have thought. Re the Dyffryn Mills, is it likely workers actually live at the mill then? Or is it just where they were when census was taken? Then it begs the question what was the 4 Meiros Street thing that I can't find at all, all I have found is that there is a Meiros Lane in Drefach, but no census info that I can find anyway. See Note 3 for Henry profession. Also thanks for the newspaper item, very interesting.
I also found that my grandparents lost a daughter Rachel Maud Jones, my Aunt, by drowning in the mill stream behind the houses in Drefach aged about 3-4yrs. She is on the 1901 Census aged 1, but not 1911, and recorded on there is 1 child deceased, interesting stuff. Can't find any newspaper items about that, maybe Osprey could point me in the right direction their please?
Well, thanks so much everybody, you are all so helpful, all I'm concerned about now is that if its the wrong marriage certificate, it could all be wrong! I just went on the first born's age assuming they were married when she was born in 1894, and Anne Evan's age, assuming she was over 16 when married, which narrowed it down to 1891 -1894. I suppose you have to assume lots without concrete evidence and just hope for the best ! Sorry about the long post, but I am extremely grateful for all your help.