Hi
I presume this is your problem
1. Nicholas Horwood Courtnell christening Date: 24 Jun 1796
Saint Thomas Portsmouth Parents William & Susannah
2. Marriage
Nicholas Courtnell/Ann Stuart 11.2.1821 Portsea, Hampshire but 1841 appears to show wife as
Elizabeth
3. Marriage
Nicholas Harwood Courtnell/Sarah Wilcox December qtr 1843 Lewisham 5 430
4. Marriage
Nicholas Courtnell/Harriett Hayes 20.7.1844
We have Nicholas b 1796 Portsea on 1851/61 married to Harriet and dying in Portsea 1867 aged 71
A Nicholas Courtnell died in Blean Kent March qtr 1844 - presumably the Nicholas who married Sarah Wilcox