Hi Dazzle,
very interested to read your post re: John Napper at Warnham, Henry Napper (1798-1862) is our great grandfather times 3 and I recently drove down to Warnham to look at the house where the family lived for 300 years. "Slaughterford" is now called Ends Place and is in the exact same spot as the house described in the Sussex Arch. Collection. The original house burnt down in 1830 but the lakes are still there and you can see exactly where Dendy Napper tried to drive his coach and horses through the lakes to win a bet (which i am sure he lost, along with everything else). The family owned several farms in the area, and they all still exist. Sparr Farm, Lakers Lodge and Tismans. All in and around Wisborough Green, which seems to be the family church going back to around 1600. There is a gap from around 1860 on, which is where the Pyrford link seems to make sense. Thanks for posting about Mathew Napper's father, that really helps me, where did you get that info from?
best wishes
Thomas Napper