Hi Monica, Yes,and the world is getting smaller. Because I've been tracing my de Smi(d)t in Biervliet I have some of the microfilms at (or coming to) a local LDS centre including marriages 1796 - 1842, so if you want next time I'm going there (early June possibly) I'll take along your details and see if there is anything to help you, starting with the marriages. However as far as I can tell the indexes only start from 1843.
Given the size of places like Biervliet and Great Somerford it's amazing anyone else has ever heard of them, let alone has relatives from there!
Thanks for your reply, cheers, Stephen