Hi Chris,
The search results page filters the data based upon your search criteria and then when you click the 'Request a Callback' button, this sends the relevant ID via POST to the page that UE4 is being used.
I've set this page to output the name and email of the record to ensure that the data is being returned correctly (which it is), but the UE behaviour will not send it to the address if it is being pulled from the DB as opposed to manually inputting the email address in the UE interface.
Sorry for any confusion my orginal post may have caused :0)
Regards
Paul