Almost solved but not quite
Thanks for the great advice so far, however I think I may have almost solved this but not completely.
1. I took a look at the code in my results page and I had forgotten that I had added the following line of code to make the date result appear in a UK format
<?php echo date ('d/m/Y', strtotime($row_WADAusers['wedding_date'])); ?>
2. I then tried previewing the pages but I was still getting the same error results with regards to the headers etc. So I then took your advice to check what date formatting I was applying when using form builder. I have started by going back into Form Builder by clicking on Edit Contents and changing the format type from Date with the format dd/mm/yyyy to selecting None. And this time there are no page errors
However, regardless of what is typed in the form field results in the most recent database entry being displayed.
I am now even more confused.
Some more help would be appreciated.