Hi Jason, many thanks for your help once again.
I think I've corrected it as you said although I wasn't too sure of what you meant by filtering the recordset email column on the email form element. However I had an educated guess. I'm now getting this error show up in the browser:
Fatal error: Call to undefined function getsqlvaluestring() in C:\wamp\www\CardiffMensConferences\my_area\users_Registration.php on line 12
Line 12 is: $query_rsEmailMatch = sprintf("SELECT * FROM users WHERE UserEmail = %s", GetSQLValueString($colname_rsEmailMatch, "text"));
But I once again attach the whole page with the revised code if you wouldn't mind having another look.