Hi Smander
Thank you very much for your reply.
I did try the CONCAT and for some reason that didnt work as not all the fields contained data.
I got this working in a round about way. As only one email address should have been added to the 3 fields on the form... I added a hidden field which is populated from the data from the three fields. This then meant that i only needed to look in that one field to see if there is an email address.
I then used this field in the CC email option.
Might not be the best way but it works so I'm happy with it :)
Thanks