Hi Steve,
You've probably got this but anyway...........
20 Oct 1803 Joseph Newport of Heddington married Sarah Smart of Bromham by Banns.
I found 2 possible baptisms for Sarah, with siblings, all in Bromham. I'll list the baptisms under the parents parents.
1. Parents Robert and Asnah (Assena or Asnah) Smart.
30 Jun 1771, Mary. 6 Mar 1774, Sarah - she was buried 28 Dec 1775. 17 Mar 1776, Robert. 15 Apr 1781, SARAH. 20 Feb 1785, William. 16 Mar 1788, Rebecca. 14 Dec 1794, Joseph.
2. Parents James and Sarah Smart (she was buried 9 Jun 1800).
10 Jul 1784, SARAH. 18 Oct 1795, George, William and Ann (a job lot)!
If you have any more info perhaps we can sort them out.
Cheers Dave