In 1911, Mary states 13 children born with 11 living.
There are 6 children at home.
1901 there are 9 children at home (the six above plus 3).
In both censuses, Richard is the oldest being 28yrs and 40 yrs.
His birth from baptism and civil registration shows a December 1870 birth.
If they were married pre civil registration, you would expect 2 or 3 children at least before Richard.
Really, this is just a thought as I also have searched but nothing shows up.
In that area, I find, that if you have a surname to search, it is very difficult as there are always so many!