I have stumbled across the following; it is the only other baptism I can find in Wiltshire anywhere near where Witt may have been. However I note the 1841 census notes he was born in Hampshire but that is not always reliable, any way no Robert born in the County near that period.
Thomas Philipps (but signed Phillips) of Marshfield, Glos. Now Wilts
Marriage by Licence: 16 Aug 1770
Marriage Place: Langridge, Somerset, England
Spouse: Ann Davis of the parish
Langridge Somerset -= Thomas & Ann
Rachael 1772 & John 1776
Did they then move back to the area where Thomas was from?
Box, Wiltshire = Phillips, parents Thomas & Ann
Mary 1777, Robert Davis 1 Nov 1778, Eleanor 1789, Thomas 1781, George 1783, Edward 1786,
Jane 1788, Ann 1789, Lydia 1789?
I can find nothing further for a Robert Davis Phillips other than his baptism.
Thomas Phillips Senior
Burial 10 Jun 1806, Box, Wiltshire
No clear death for Ann. I wonder if these are two of the children from above?
John Phillips from Bath Burial 24 Feb 1811 Box
Jane Phillips from Christian Malford Burial 2 Jun 1811 Box
Colin