That fixed the error message
"2) The Unicode Signature (BOM) PHP bug. the forth screen shot shows the Title / Encoding category of the Page Properties screen (Modify - > Page Properties). Checking the Include Signature (BOM) option can cause the headers already sent error"
The original site set up needed the BOM option set. Now that it runs on UTF-8 its not needed. Removing it cured the error message. Thanks for that one.
Now I just have to work out how to use iUE4 with a form.
Documentation for using it with forms does not seem to exist. Unlike UE3!