Hi Nico,
Although there are no sources quoted on ridrev's work, what we can say is;
A Henry Lipscombe & a Mary Ann Mitchell were on the same page for a marriage in Q1 1883 in Cuckfield reg district. Both were young, Mary Ann being born about 1864 & Henry 1865.
Two likely births are registered,
1. Henry John Lipscombe Q4 1883 Cuckfield reg. district.
2. WILLIAM JAMES Lipscombe Q1 1885 Cuckfield reg district.
A likely death, Henry Lipscombe age 19 Q3 1884, Cuckfield.
In 1881 Plumpton
Henry Lipscombe 46 Brickmaker b. Havant Hants
Jane 43 b. Petersfield, Hants
HENRY 16 b. Bute? Scotland
William 12 b. L...? Scotland
Thomas 10 b. A...? Scotland
Mary 8 ditto
Gilbert 11 b. Forefar Scotland
To me it looks like this is the Henry/Harry father of William James. Further evidence is that Mary Ann is back with her parents in 1891, the Mitchells.
In 1881 there's another Lipscombe family on the same page a William & Mary, possibly a brother to Henry senior above?
The birth certificate will give you William's mother's maiden name which should be Mitchell.
As Henry junior died so young perhaps he was killed in an accident? A newspaper of that time & locality might have something also a MI might survive which could give more clue's. If it was an accident a coronors report might exist.
jane