I'm struggling! Flitton with Silsoe baptisms and marriages are on the IGI, and whilst I can see the baptisms of their children I can't see their marriage or their own baptisms. Do you have the birth cert of any of their children which will at least confirm Susannah's maiden name? Frances Goodwin Odell, which is where I assume you have taken the name Goodwin from, in the March quarter 1841 in Ampthill registration district vol 6 page 14 seems the best bet if you don't have one.