Just to clarify what we know so far and my own conclusions.
We know that Alfred Jupp DENYER was born in 1864 the illegitimate son of Fanny DENYER.
Mary Jane SMITH was born c1874/76 reputedly in Coldwaltham, parentage unknown.
Alfred Jupp DENYER married Mary Jane SMITH in 1897
In 1901 Alfred is apart from Mary Jane and working as a groom, he declares himself to be married
Also in 1901 Mary Jane is visiting an ANDREWS family with son Frederick, she also states she is married.
By 1911 Mary Jane is housekeeper to Charles GALE, still stating she is married, however,
Alfred is gardener to a Clement CLARK, but now says he is single. This would indicate the marriage was very short lived.
This looks like a possible death for Alfred
Deaths Dec 1915
Denyer Alfred J 52 Petworth 2b 450
The other Alfred DENYERs that have been considered
1. Alfred born c1862 in Horsham, he married Jane BRIDGEWATER in 1891, they only had two daughters Rose and Mary J. although Jane has acquired the name Mary Jane by 1911, this couple can be discounted.
2. Alfred born Hangleton c1872, married Mary Jane WALDER in 1897, they had five children including Mary Victoria, Nathan and Edward, plus two other children born before 1911 who did not survive until then. This is the couple who lived in Wish Cottage so can also be discounted.
There is no sign of the supposed marriage of Mary Jane to a ? SEARLE in 1915, although she would have been free to do so because of the above mentoned death.
As there do not appear to have been any children from Mary Jane's marriage to Alfred, there is little point in looking any further into the DENYER families. Concentration should be on the very difficult task of locating the birth of Mary Jane SMITH, that is the bloodline of Frederick.